Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 245,886	$ 262,342
Gross Unrealized Gains	0	0
Gross Unrealized Losses	22,331	24,464
AFS, at fair value	223,555	237,878
Held-to-maturity
Amortized Cost	399,128	399,494
Gross Unrealized Gains	13	0
Gross Unrealized Losses	41,620	50,989
Estimated Fair Value	357,521	348,505
Amortized Cost	645,014	661,836
Gross Unrealized Gains	13	0
Gross Unrealized Losses	63,951	75,453
Estimated Fair Value	581,076	586,383
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	36,637	36,528
Gross Unrealized Gains	0	0
Gross Unrealized Losses	988	1,614
AFS, at fair value	35,649	34,914
Held-to-maturity
Amortized Cost	245,805	245,671
Gross Unrealized Gains	2	0
Gross Unrealized Losses	28,676	34,834
Estimated Fair Value	217,131	210,837
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	169,184	185,993
Gross Unrealized Gains	0	0
Gross Unrealized Losses	16,501	19,078
AFS, at fair value	152,683	166,915
Held-to-maturity
Amortized Cost	43,818	50,710
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,523	6,676
Estimated Fair Value	38,295	44,034
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,332	4,354
Gross Unrealized Gains	0	0
Gross Unrealized Losses	686	815
AFS, at fair value	3,646	3,539
Held-to-maturity
Amortized Cost	84,035	87,125
Gross Unrealized Gains	11	0
Gross Unrealized Losses	6,486	8,345
Estimated Fair Value	77,560	78,780
Corporate debt securities
Available-for-sale
Amortized Cost	35,733	35,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,156	2,957
AFS, at fair value	31,577	32,510
Held-to-maturity
Amortized Cost	25,470	15,988
Gross Unrealized Gains	0	0
Gross Unrealized Losses	935	1,134
Estimated Fair Value	$ 24,535	$ 14,854

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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