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Investment Securities - Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 2,302,763 [1]   $ 2,288,791 [2]      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (1,500) [1] $ (1,500) (1,500) [2] $ (1,500) $ (1,500) $ (1,500)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 2,301,263 [1]   2,287,291 [2]      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2,670 [1]   1,760 [2]      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (74,451) [1]   (120,735) [2]      
Securities held to maturity, fair value 2,229,482 [1]   2,168,316 [2]      
Interest Receivable 12,700   10,000      
Municipal securities            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,250,254   1,247,310      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (140)   (140)      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 1,250,114   1,247,170      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2,670   1,760      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (16,849)   (28,170)      
Securities held to maturity, fair value 1,235,935   1,220,760      
Agency commercial MBS (1)            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 438,781   433,827      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 438,781   433,827      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (18,745)   (30,665)      
Securities held to maturity, fair value 420,036   403,162      
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 354,098   350,493      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 354,098   350,493      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14,694)   (29,289)      
Securities held to maturity, fair value 339,404   321,204      
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 189,239   187,033      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 189,239   187,033      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8,812)   (11,454)      
Securities held to maturity, fair value 180,427   175,579      
Corporate Debt Securities            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,391   70,128      
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (1,360)   (1,360)      
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 69,031   68,768      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15,351)   (21,157)      
Securities held to maturity, fair value 53,680   47,611      
Held-to-maturity Securities            
Schedule of Held-to-maturity Securities [Line Items]            
Interest Receivable $ 11,300   $ 13,400      
[1] Excludes accrued interest receivable of $11.3 million at September 30, 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