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Investment Securities - Securities Held-to-Maturity Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
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