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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 310,018	$ 307,036	$ 333,152
Unrealized Gains	3,722	7,272	8,157
Unrealized Losses	(4,516)	(932)	(1,169)
Fair Value (Estimated)	309,224	313,376	340,140
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	23,045	27,545
Unrealized Gains	0	0	180
Unrealized Losses	(1,106)	(315)	(228)
Fair Value (Estimated)	21,939	22,730	27,497
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	247,606	238,516	270,336
Unrealized Gains	2,751	5,507	6,737
Unrealized Losses	(3,104)	(617)	(649)
Fair Value (Estimated)	247,253	243,406	276,424
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,590	37,752	35,271
Unrealized Gains	895	1,722	1,240
Unrealized Losses	(306)	0	(292)
Fair Value (Estimated)	35,179	39,474	$ 36,219
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,777	7,723
Unrealized Gains	76	43
Unrealized Losses	0	0
Fair Value (Estimated)	$ 4,853	$ 7,766

X

- 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).

+ References

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-Topic 320
-SubTopic 10
-Section 50
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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).

+ References

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+ References

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-Publisher FASB
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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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