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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 353,140	$ 341,113	$ 343,599
Unrealized Gains	2	57	4
Unrealized Losses	(68,170)	(56,661)	(60,335)
Fair Value (Estimated)	284,972	284,509	283,268
U.S. Treasury & Agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,851	26,025	26,023
Unrealized Gains	0	0	0
Unrealized Losses	(7,599)	(6,878)	(6,879)
Fair Value (Estimated)	38,252	19,147	19,144
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	263,775	271,068	273,215
Unrealized Gains	1	55	4
Unrealized Losses	(50,930)	(42,447)	(44,041)
Fair Value (Estimated)	212,846	228,676	229,178
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,417	40,472	40,489
Unrealized Gains	0	2	0
Unrealized Losses	(9,637)	(7,283)	(9,383)
Fair Value (Estimated)	30,780	33,191	31,106
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,097	3,548	3,872
Unrealized Gains	1	0	0
Unrealized Losses	(4)	(53)	(32)
Fair Value (Estimated)	$ 3,094	$ 3,495	$ 3,840

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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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