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Investment Securities - Securities Held-to-Maturity Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period $ 1,500 $ 1,500 $ 1,500 [1] $ 1,500  
Provision for Credit Losses 0 0 0 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for Credit Losses, End of Period 1,500 [2] 1,500 1,500 [2] 1,500  
Securities held to maturity, fair value 2,229,482 [2]   2,229,482 [2]   $ 2,168,316 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2,670 [2]   2,670 [2]   1,760 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (74,451) [2]   (74,451) [2]   (120,735) [1]
U.S. Treasury securities          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period     0    
Allowance for Credit Losses, End of Period 0   0    
Securities held to maturity, fair value 180,427   180,427   175,579
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8,812)   (8,812)   (11,454)
Municipal securities          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period     140    
Allowance for Credit Losses, End of Period 140   140    
Securities held to maturity, fair value 1,235,935   1,235,935   1,220,760
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2,670   2,670   1,760
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (16,849)   (16,849)   (28,170)
Agency commercial MBS (1)          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period     0    
Allowance for Credit Losses, End of Period 0   0    
Securities held to maturity, fair value 420,036   420,036   403,162
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (18,745)   (18,745)   (30,665)
Private label commercial MBS          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period     0    
Allowance for Credit Losses, End of Period 0   0    
Securities held to maturity, fair value 339,404   339,404   321,204
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14,694)   (14,694)   (29,289)
Corporate Debt Securities          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period     1,360    
Allowance for Credit Losses, End of Period 1,360   1,360    
Securities held to maturity, fair value 53,680   53,680   47,611
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15,351)   (15,351)   $ (21,157)
Municipal securities          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period 140 140 140 140  
Provision for Credit Losses 0 0 0 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for Credit Losses, End of Period 140 140 140 140  
Corporate Debt Securities          
Schedule of Held-to-maturity Securities [Line Items]          
Allowance for Credit Losses, Beginning of Period 1,360 1,360 1,360 1,360  
Provision for Credit Losses 0 0 0 0  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Allowance for Credit Losses, End of Period $ 1,360 $ 1,360 $ 1,360 $ 1,360  
[1] Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] Excludes accrued interest receivable of $11.3 million at September 30, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets