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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 |

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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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