Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 322,741	$ 307,036
Unrealized Gains	2,954	7,272
Unrealized Losses	(5,129)	(932)
Fair Value (Estimated)	320,566	313,376
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,045	23,045
Unrealized Gains	0	0
Unrealized Losses	(1,146)	(315)
Fair Value (Estimated)	21,899	22,730
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	256,992	238,516
Unrealized Gains	1,803	5,507
Unrealized Losses	(3,895)	(617)
Fair Value (Estimated)	254,900	243,406
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,127	37,752
Unrealized Gains	1,083	1,722
Unrealized Losses	(88)	0
Fair Value (Estimated)	39,122	39,474
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,577	7,723
Unrealized Gains	68	43
Unrealized Losses	0	0
Fair Value (Estimated)	$ 4,645	$ 7,766

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Paragraph 2
-Subparagraph (c)
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Amortized cost excluding accrued interest, after 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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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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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