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Investment Securities - Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 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 $ 2,298,208 [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 2,296,708 [1]   2,287,291 [2]      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 46 [1]   1,760 [2]      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (150,825) [1]   (120,735) [2]      
Securities held to maturity, fair value 2,145,929 [1]   2,168,316 [2]      
Municipal securities            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,249,421   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 1,249,281   1,247,170      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 46   1,760      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (51,317)   (28,170)      
Securities held to maturity, fair value 1,198,010   1,220,760      
Agency commercial MBS            
Schedule of Held-to-maturity Securities [Line Items]            
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 437,110   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 437,110   433,827      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (36,391)   (30,665)      
Securities held to maturity, fair value 400,719   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 352,880   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 352,880   350,493      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (30,053)   (29,289)      
Securities held to maturity, fair value 322,827   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 188,495   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 188,495   187,033      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (16,566)   (11,454)      
Securities held to maturity, fair value 171,929   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 70,302   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 68,942   68,768      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0      
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (16,498)   (21,157)      
Securities held to maturity, fair value 52,444   47,611      
Interest Receivable $ 13,400   $ 13,400      
[1] Excludes accrued interest receivable of $13.4 million at June 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