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Allowance for Credit Losses and Unfunded Loan Commitments - Payment Status (Amortized Cost Basis) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 1,001,410 | $ 373,683
Financing receivable, modified in period, to total financing receivables, percentage | 100.00% | 100.00%
Amortization cost basis | $ 40,400 | $ 8,400
Loan Deferment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | 33,645 | 6,843
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 826,007 | $ 334,967
Financing receivable, modified in period, to total financing receivables, percentage | 83.00% | 90.00%
30-59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 77,446 | $ 17,205
Financing receivable, modified in period, to total financing receivables, percentage | 8.00% | 4.00%
60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 43,484 | $ 7,689
Financing receivable, modified in period, to total financing receivables, percentage | 4.00% | 2.00%
90 Days or Greater Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 54,473 | $ 13,822
Financing receivable, modified in period, to total financing receivables, percentage | 5.00% | 4.00%
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, ,modified in period, amount | $ 1,035,055 | $ 380,526
Amortization cost basis | $ 40,400 |

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