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Investment Securities - Summary of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities $ 538,157 $ 585,052
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 731 228
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (68,114) (80,952)
Fair value 470,774 504,328
U.S. Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities 49,563 49,338
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (406) (1,004)
Fair value 49,157 48,334
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 270,518 299,337
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 705 226
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (28,386) (34,552)
Fair value 242,837 265,011
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 218,076 236,377
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 26 2
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (39,322) (45,396)
Fair value $ 178,780 $ 190,983