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Investment Securities - Securities Held-to-Maturity Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]      
Allowance for Credit Losses, Beginning of Period $ 1,500 [1] $ 1,500  
Provision for Credit Losses 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period 1,500 [2] 1,500  
Securities held to maturity, fair value 2,153,349 [2]   $ 2,168,316 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 676 [2]   1,760 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (139,311) [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    
Securities held to maturity, fair value 172,338   175,579
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15,421)   (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    
Securities held to maturity, fair value 1,206,812   1,220,760
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 676   1,760
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (42,079)   (28,170)
Agency 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    
Securities held to maturity, fair value 400,848   403,162
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (34,619)   (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    
Securities held to maturity, fair value 323,189   321,204
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,499)   (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    
Securities held to maturity, fair value 50,162   47,611
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (18,693)   $ (21,157)
Municipal securities      
Schedule of Held-to-maturity Securities [Line Items]      
Allowance for Credit Losses, Beginning of Period 140 140  
Provision for Credit Losses 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period 140 140  
Corporate Debt Securities      
Schedule of Held-to-maturity Securities [Line Items]      
Allowance for Credit Losses, Beginning of Period 1,360 1,360  
Provision for Credit Losses 0 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period $ 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 March 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets