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Investment Securities - Securities Held-to-Maturity Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]      
Allowance for Credit Losses, Beginning of Period $ 1,500 [1] $ 1,500  
Provision for Credit Losses (900) 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period 600 [2] 1,500  
Securities held to maturity, fair value 2,179,910 [2]   $ 2,156,694 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 61 [2]   35 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (132,063) [2]   (149,490) [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 178,435   173,283
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (12,291)   (16,702)
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 20    
Securities held to maturity, fair value 1,192,833   1,196,460
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 61   35
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (59,663)   (54,799)
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 414,035   402,636
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,137)   (37,840)
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 336,745   329,116
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (19,841)   (26,226)
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 580    
Securities held to maturity, fair value 57,862   55,199
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0   0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (12,131)   $ (13,923)
Municipal securities      
Schedule of Held-to-maturity Securities [Line Items]      
Allowance for Credit Losses, Beginning of Period 140 140  
Provision for Credit Losses (120) 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period 20 140  
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 (780) 0  
Charge-offs 0 0  
Recoveries 0 0  
Allowance for Credit Losses, End of Period $ 580 $ 1,360  
[1] Excludes accrued interest receivable of $13.4 million at December 31, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] Excludes accrued interest receivable of $11.3 million at March 31, 2025 which is recorded in "Other assets" on the condensed consolidated balance sheets