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Investment Securities - Securities Held-to-Maturity Credit Quality Indicators (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 2,293,484 | [1] | $ 2,288,791 | [2]
Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 915,954 |  | 914,620 |
Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,022,729 |  | 1,018,402 |
Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 166,758 |  | 167,905 |
Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,783 |  | 1,787 |
Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 44,405 |  | 44,371 |
Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 43,520 |  | 43,456 |
Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 86,334 |  | 86,243 |
Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 12,001 |  | 12,007 |
Municipal securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,248,355 |  | 1,247,310 |
Municipal securities | Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 564,266 |  | 564,127 |
Municipal securities | Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 399,503 |  | 397,542 |
Municipal securities | Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 166,758 |  | 167,905 |
Municipal securities | Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,783 |  | 1,787 |
Municipal securities | Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Municipal securities | Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Municipal securities | Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 17,710 |  | 17,699 |
Municipal securities | Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 86,334 |  | 86,243 |
Municipal securities | Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 12,001 |  | 12,007 |
Agency commercial MBS |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 435,467 |  | 433,827 |
Agency commercial MBS | Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 435,467 |  | 433,827 |
Agency commercial MBS | Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Agency commercial MBS | Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 351,688 |  | 350,493 |
Private label commercial MBS | Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 351,688 |  | 350,493 |
Private label commercial MBS | Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Private label commercial MBS | Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 187,759 |  | 187,033 |
U.S. Treasury securities | Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 187,759 |  | 187,033 |
U.S. Treasury securities | Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
U.S. Treasury securities | Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 70,215 |  | 70,128 |
Corporate Debt Securities | Standard & Poor's, AAA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, AA+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, AA Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, A Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, A- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, BBB Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 44,405 |  | 44,371 |
Corporate Debt Securities | Standard & Poor's, No Credit Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 25,810 |  | 25,757 |
Corporate Debt Securities | Standard & Poor's, AA- Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 |  | 0 |
Corporate Debt Securities | Standard & Poor's, A+ Rating |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 0 |  | $ 0 |
[1] | Excludes accrued interest receivable of $11.3 million at March 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] | Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets

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