Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 254,863	$ 262,342
Gross Unrealized Gains	0	0
Gross Unrealized Losses	26,089	24,464
Estimated Fair Value	228,774	237,878
Held-to-maturity
Amortized Cost	404,831	399,494
Gross Unrealized Gains	2	0
Gross Unrealized Losses	49,044	50,989
Estimated Fair Value	355,789	348,505
Amortized Cost	659,694	661,836
Gross Unrealized Gains	2	0
Gross Unrealized Losses	75,133	75,453
Estimated Fair Value	584,563	586,383
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	36,581	36,528
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,654	1,614
Estimated Fair Value	34,927	34,914
Held-to-maturity
Amortized Cost	245,737	245,671
Gross Unrealized Gains	0	0
Gross Unrealized Losses	33,401	34,834
Estimated Fair Value	212,336	210,837
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	177,964	185,993
Gross Unrealized Gains	0	0
Gross Unrealized Losses	19,264	19,078
Estimated Fair Value	158,700	166,915
Held-to-maturity
Amortized Cost	47,129	50,710
Gross Unrealized Gains	0	0
Gross Unrealized Losses	6,379	6,676
Estimated Fair Value	40,750	44,034
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,343	4,354
Gross Unrealized Gains	0	0
Gross Unrealized Losses	782	815
Estimated Fair Value	3,561	3,539
Held-to-maturity
Amortized Cost	86,486	87,125
Gross Unrealized Gains	2	0
Gross Unrealized Losses	8,047	8,345
Estimated Fair Value	78,441	78,780
Corporate debt securities
Available-for-sale
Amortized Cost	35,975	35,467
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,389	2,957
Estimated Fair Value	31,586	32,510
Held-to-maturity
Amortized Cost	25,479	15,988
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,217	1,134
Estimated Fair Value	$ 24,262	$ 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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