2109100 - Disclosure - Allowance for Loan Losses
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2409410 - Disclosure - Allowance for Loan Losses - Accrued Interest Receivable (Detail)
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2409403 - Disclosure - Allowance for Loan Losses - Additional Information (Detail)
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2409409 - Disclosure - Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail)
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2409402 - Disclosure - Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail)
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2409405 - Disclosure - Allowance for Loan Losses - Average Recorded Investment and Interest Income Recognized for TDR (Details)
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2409408 - Disclosure - Allowance for Loan Losses - Loan Portfolio Stratified by Key Credit Quality Indicators (Detail)
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2409406 - Disclosure - Allowance for Loan Losses - Loan Status and Aging of Past Due TDR Loans (Details)
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2409407 - Disclosure - Allowance for Loan Losses - Modified Loan Accounts for TDR (Details)
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2409404 - Disclosure - Allowance for Loan Losses - Recorded Investment, Unpaid Principal Balance and Related Allowance for TDR Loans (Details)
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2309301 - Disclosure - Allowance for Loan Losses (Tables)
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2120100 - Disclosure - Arrangements with Navient Corporation
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2420401 - Disclosure - Arrangements with Navient Corporation (Details)
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2111100 - Disclosure - Borrowings
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2411403 - Disclosure - Borrowings - Additional Information (Details)
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2411402 - Disclosure - Borrowings - Company Borrowings (Details)
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2411405 - Disclosure - Borrowings - Financing VIEs (Details)
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2411404 - Disclosure - Borrowings - Securitizations (Details)
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2311301 - Disclosure - Borrowings (Tables)
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2122100 - Disclosure - Commitments, Contingencies and Guarantees
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2422401 - Disclosure - Commitments, Contingencies and Guarantees - Additional Information (Detail)
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1001000 - Statement - CONSOLIDATED BALANCE SHEETS
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1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)
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1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS
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1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
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1004001 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)
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1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
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1002000 - Statement - CONSOLIDATED STATEMENTS OF INCOME
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2110100 - Disclosure - Deposits
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2410403 - Disclosure - Deposits - Additional Information (Details)
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2410404 - Disclosure - Deposits - Interest Bearing Deposits (Details)
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2410402 - Disclosure - Deposits - Summary (Details)
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2310301 - Disclosure - Deposits (Tables)
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2115100 - Disclosure - Derivative Financial Instruments
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2415402 - Disclosure - Derivative Financial Instruments - Additional Information (Detail)
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2415403 - Disclosure - Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail)
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2415407 - Disclosure - Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Changes in Stockholders' Equity (Details)
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2415406 - Disclosure - Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Details)
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2415405 - Disclosure - Derivative Financial Instruments - Notional Values (Details)
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2415404 - Disclosure - Derivative Financial Instruments - Offsetting Assets and Liabilities (Details)
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2315301 - Disclosure - Derivative Financial Instruments (Tables)
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0001000 - Document - Document and Entity Information
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2118100 - Disclosure - Earnings per Common Share
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2418402 - Disclosure - Earnings per Common Share (Details)
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2318301 - Disclosure - Earnings per Common Share (Tables)
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2119100 - Disclosure - Fair Value Measurements
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2419403 - Disclosure - Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail)
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2319301 - Disclosure - Fair Value Measurements (Tables)
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2108100 - Disclosure - Loans Held for Investment
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2408402 - Disclosure - Loans Held for Investment - Additional Information (Detail)
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2408404 - Disclosure - Loans Held for Investment - Student Loan Portfolio Average Balances (Details)
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2408403 - Disclosure - Loans Held for Investment - Student Loan Portfolio by Program (Detail)
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2308301 - Disclosure - Loans Held for Investment (Tables)
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2121100 - Disclosure - Regulatory Capital
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2421403 - Disclosure - Regulatory Capital - Additional Information (Details)
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2321301 - Disclosure - Regulatory Capital (Tables)
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2421402 - Disclosure - Regulatory Capital - Well Capitalized Regulatory Requirements (Details)
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2401402 - Disclosure - Significant Accounting Polices - Narrative (Details)
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2101100 - Disclosure - Significant Accounting Policies
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2201201 - Disclosure - Significant Accounting Policies (Policies)
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2117100 - Disclosure - Stockholders' Equity
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2417403 - Disclosure - Stockholders' Equity - Additional Detail (Details)
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2417402 - Disclosure - Stockholders' Equity - Common stock repurchased (Details)
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2317301 - Disclosure - Stockholders' Equity (Tables)
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2123100 - Disclosure - Subsequent Event
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2423401 - Disclosure - Subsequent Event (Details)
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