Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 258,570	$ 262,342
Gross Unrealized Gains	0	0
Gross Unrealized Losses	21,961	24,464
Estimated Fair Value	236,609	237,878
Held-to-maturity
Amortized Cost	396,784	399,494
Gross Unrealized Gains	33	0
Gross Unrealized Losses	44,363	50,989
Estimated Fair Value	352,454	348,505
Amortized Cost	655,354	661,836
Gross Unrealized Gains	33	0
Gross Unrealized Losses	66,324	75,453
Estimated Fair Value	589,063	586,383
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	36,554	36,528
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,304	1,614
Estimated Fair Value	35,250	34,914
Held-to-maturity
Amortized Cost	245,703	245,671
Gross Unrealized Gains	0	0
Gross Unrealized Losses	30,853	34,834
Estimated Fair Value	214,850	210,837
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	182,196	185,993
Gross Unrealized Gains	0	0
Gross Unrealized Losses	16,592	19,078
Estimated Fair Value	165,604	166,915
Held-to-maturity
Amortized Cost	49,050	50,710
Gross Unrealized Gains	0	0
Gross Unrealized Losses	6,061	6,676
Estimated Fair Value	42,989	44,034
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,349	4,354
Gross Unrealized Gains	0	0
Gross Unrealized Losses	652	815
Estimated Fair Value	3,697	3,539
Held-to-maturity
Amortized Cost	87,048	87,125
Gross Unrealized Gains	33	0
Gross Unrealized Losses	6,324	8,345
Estimated Fair Value	80,757	78,780
Corporate debt securities
Available-for-sale
Amortized Cost	35,471	35,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,413	2,957
Estimated Fair Value	32,058	32,510
Held-to-maturity
Amortized Cost	14,983	15,988
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,125	1,134
Estimated Fair Value	$ 13,858	$ 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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