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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

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