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Investment Securities - Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]        
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 2,312,512 $ 2,307,649 [1]    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (600) [2] (1,500) [1] $ (1,500) $ (1,500)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 2,311,912 [2] 2,306,149 [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]    
Securities held to maturity, fair value 2,179,910 [2] 2,156,694 [1]    
Interest Receivable 13,000 12,600    
Municipal securities        
Schedule of Held-to-maturity Securities [Line Items]        
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,252,455 1,251,364    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (20) (140)    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 1,252,435 1,251,224    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 61 35    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (59,663) (54,799)    
Securities held to maturity, fair value 1,192,833 1,196,460    
Agency commercial MBS        
Schedule of Held-to-maturity Securities [Line Items]        
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 442,172 440,476    
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 442,172 440,476    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (28,137) (37,840)    
Securities held to maturity, fair value 414,035 402,636    
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 356,586 355,342    
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 356,586 355,342    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (19,841) (26,226)    
Securities held to maturity, fair value 336,745 329,116    
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 190,726 189,985    
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 190,726 189,985    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (12,291) (16,702)    
Securities held to maturity, fair value 178,435 173,283    
Corporate Debt Securities        
Schedule of Held-to-maturity Securities [Line Items]        
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,573 70,482    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (580) (1,360)    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 69,993 69,122    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0    
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (12,131) (13,923)    
Securities held to maturity, fair value 57,862 55,199    
Held-to-maturity Securities        
Schedule of Held-to-maturity Securities [Line Items]        
Interest Receivable $ 11,300 $ 13,400    
[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