Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale
Amortized Cost	$ 242,129	$ 245,886
Gross Unrealized Gains	0	0
Gross Unrealized Losses	24,497	22,331
Estimated Fair Value	217,632	223,555
Held-to-maturity
Amortized Cost	396,998	399,128
Gross Unrealized Gains	2	13
Gross Unrealized Losses	45,796	41,620
Estimated Fair Value	351,204	357,521
Amortized Cost	639,127	645,014
Gross Unrealized Gains	2	13
Gross Unrealized Losses	70,293	63,951
Estimated Fair Value	568,836	581,076
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	36,664	36,637
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,174	988
Estimated Fair Value	35,490	35,649
Held-to-maturity
Amortized Cost	245,839	245,805
Gross Unrealized Gains	0	2
Gross Unrealized Losses	30,821	28,676
Estimated Fair Value	215,018	217,131
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	165,402	169,184
Gross Unrealized Gains	0	0
Gross Unrealized Losses	18,637	16,501
Estimated Fair Value	146,765	152,683
Held-to-maturity
Amortized Cost	42,376	43,818
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,869	5,523
Estimated Fair Value	36,507	38,295
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,326	4,332
Gross Unrealized Gains	0	0
Gross Unrealized Losses	693	686
Estimated Fair Value	3,633	3,646
Held-to-maturity
Amortized Cost	83,318	84,035
Gross Unrealized Gains	2	11
Gross Unrealized Losses	6,958	6,486
Estimated Fair Value	76,362	77,560
Corporate debt securities
Available-for-sale
Amortized Cost	35,737	35,733
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,993	4,156
Estimated Fair Value	31,744	31,577
Held-to-maturity
Amortized Cost	25,465	25,470
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,148	935
Estimated Fair Value	$ 23,317	$ 24,535

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cumulative unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cumulative unrecognized loss on investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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