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Investment Securities - Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 2,304,352 $ 2,307,649 [1]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (695) [2] (1,500) [1]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 2,303,657 [2] 2,306,149 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1,285 [2] 35 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (81,320) [2] (149,490) [1]
Securities held to maturity, fair value 2,223,622 [2] 2,156,694 [1]
Interest Receivable 12,200 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 1,236,645 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 1,236,625 1,251,224
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1,285 35
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (33,921) (54,799)
Securities held to maturity, fair value 1,203,989 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 445,605 440,476
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 445,605 440,476
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (20,778) (37,840)
Securities held to maturity, fair value 424,827 402,636
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 359,091 355,342
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 359,091 355,342
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (10,467) (26,226)
Securities held to maturity, fair value 348,624 329,116
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 192,255 189,985
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 192,255 189,985
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (8,719) (16,702)
Securities held to maturity, fair value 183,536  
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,756 70,482
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (675) (1,360)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 70,081 69,122
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (7,435) (13,923)
Securities held to maturity, fair value 62,646 55,199
Held-to-maturity Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Interest Receivable $ 11,200 $ 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 $11.2 million at September 30, 2025 which is recorded in "Other assets" on the condensed consolidated balance sheets