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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] |  |
Amortized Cost | $ 693,873 | $ 683,895
Allowance for Credit Losses | (236) | (238)
Gross Unrealized Gains | 4,098 | 2,266
Gross Unrealized Losses | (61,206) | (73,901)
Fair Value | 636,529 | 612,022
U.S. government sponsored agencies |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 196,642 | 188,475
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 1,234 | 489
Gross Unrealized Losses | (6,266) | (8,139)
Fair Value | 191,610 | 180,825
States and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 141,918 | 144,496
Allowance for Credit Losses | (236) | (238)
Gross Unrealized Gains | 158 | 134
Gross Unrealized Losses | (26,166) | (30,104)
Fair Value | 115,674 | 114,288
Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 256,329 | 248,559
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 2,558 | 1,643
Gross Unrealized Losses | (15,388) | (18,582)
Fair Value | 243,499 | 231,620
Commercial mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 98,984 | 102,365
Allowance for Credit Losses | 0 | 0
Gross Unrealized Gains | 148 | 0
Gross Unrealized Losses | (13,386) | (17,076)
Fair Value | $ 85,746 | $ 85,289

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