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Investment Securities - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale
Amortized Cost	$ 271,831	$ 245,886
Gross Unrealized Gains	0	0
Gross Unrealized Losses	16,604	22,331
Estimated Fair Value	255,227	223,555
Held-to-maturity
Amortized Cost	386,618	399,128
Gross Unrealized Gains	0	13
Gross Unrealized Losses	32,253	41,620
Estimated Fair Value	354,365	357,521
Amortized Cost	658,449	645,014
Gross Unrealized Gains	0	13
Gross Unrealized Losses	48,857	63,951
Estimated Fair Value	609,592	581,076
U.S. Treasury and U.S. government agencies
Available-for-sale
Amortized Cost	27,720	36,637
Gross Unrealized Gains	0	0
Gross Unrealized Losses	484	988
Estimated Fair Value	27,236	35,649
Held-to-maturity
Amortized Cost	241,907	245,805
Gross Unrealized Gains	0	2
Gross Unrealized Losses	21,463	28,676
Estimated Fair Value	220,444	217,131
Mortgage-backed U.S. government agencies
Available-for-sale
Amortized Cost	204,050	169,184
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11,888	16,501
Estimated Fair Value	192,162	152,683
Held-to-maturity
Amortized Cost	39,213	43,818
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,233	5,523
Estimated Fair Value	34,980	38,295
State and political subdivision obligations
Available-for-sale
Amortized Cost	4,315	4,332
Gross Unrealized Gains	0	0
Gross Unrealized Losses	554	686
Estimated Fair Value	3,761	3,646
Held-to-maturity
Amortized Cost	80,042	84,035
Gross Unrealized Gains	0	11
Gross Unrealized Losses	5,238	6,486
Estimated Fair Value	74,804	77,560
Corporate debt securities
Available-for-sale
Amortized Cost	35,746	35,733
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,678	4,156
Estimated Fair Value	32,068	31,577
Held-to-maturity
Amortized Cost	25,456	25,470
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,319	935
Estimated Fair Value	$ 24,137	$ 24,535

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- Definition

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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