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Investment Securities - Securities Held-to-Maturity Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 2,312,512 $ 2,307,649 [1]
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 928,106 926,689
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 1,002,212 999,533
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 219,130 218,581
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 1,664 1,667
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 44,542 44,507
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 43,788 43,720
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 73,070 72,952
Municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,252,455 1,251,364
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 571,520 571,347
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 369,314 369,072
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 219,130 218,581
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 1,664 1,667
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 17,757 17,745
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 73,070 72,952
Agency commercial MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 442,172 440,476
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 442,172 440,476
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, 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
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 356,586 355,342
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 356,586 355,342
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, 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
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 190,726 189,985
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 190,726 189,985
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, 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
Corporate Debt Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,573 70,482
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, BBB Rating    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 44,542 44,507
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 26,031 25,975
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
[1] Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets