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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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

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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). + References 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) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition 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 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 (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition 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 + Details
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