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Investment Securities - Securities Held-to-Maturity Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 2,304,352 $ 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 926,022 926,689
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 1,001,444 999,533
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 220,246 218,581
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 84,175 72,952
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   1,667
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 46,318 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 26,147 43,720
Municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,236,645 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 566,931 571,347
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 363,584 369,072
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 220,246 218,581
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 84,175 72,952
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   1,667
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 1,709 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 0 17,745
Agency commercial MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 445,605 440,476
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 445,605 440,476
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, 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
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
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 359,091 355,342
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 359,091 355,342
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, 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
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
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 192,255 189,985
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 192,255 189,985
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, 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
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
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,756 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, 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
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 44,609 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 $ 26,147 $ 25,975
[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