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Investment Securities - Summary of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities $ 689,486 $ 533,108
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 2,477 51
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (61,161) (81,773)
Fair value 630,802 451,386
U.S. Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities 24,840 49,639
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (120) (480)
Fair value 24,720 49,159
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities 244,916 271,105
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 469 51
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (25,682) (36,870)
Fair value 219,703 234,286
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities 419,730 212,364
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 2,008  
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (35,359) (44,423)
Fair value $ 386,379 $ 167,941