v3.26.1
Investment Securities - Securities Held-to-Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss $ 2,314,243 $ 2,309,331 [1]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (695) [2] (695) [1]
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 2,313,548 [2] 2,308,636 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 248 [2] 2,052 [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (86,796) [2] (64,162) [1]
Securities held to maturity, fair value 2,227,000 [2] 2,246,526 [1]
Interest Receivable 12,300 11,400
Municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 1,238,920 1,237,792
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (20) (20)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 1,238,900 1,237,772
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 248 2,052
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (35,299) (20,713)
Securities held to maturity, fair value 1,203,849 1,219,111
Agency commercial MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 448,918 447,283
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 448,918 447,283
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (21,671) (19,645)
Securities held to maturity, fair value 427,247 427,638
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 361,672 360,382
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 361,672 360,382
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (13,197) (9,606)
Securities held to maturity, fair value 348,475 350,776
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 193,784 193,022
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 193,784 193,022
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (9,673) (7,934)
Securities held to maturity, fair value 184,111  
Corporate debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 70,949 70,852
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest (675) (675)
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total 70,274 70,177
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (6,956) (6,264)
Securities held to maturity, fair value 63,318 63,913
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, 2025 which is recorded in "Other assets" on the consolidated balance sheets
[2] Excludes accrued interest receivable of $11.2 million at March 31, 2026 which is recorded in "Other assets" on the consolidated balance sheet