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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, AFS (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 307,036 | $ 355,890
Unrealized Gains | 7,272 | 5,565
Unrealized Losses | (932) | (935)
Fair Value (Estimated) | 313,376 | 360,520
U.S. government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 23,045 | 7,500
Unrealized Gains | 0 | 0
Unrealized Losses | (315) | (102)
Fair Value (Estimated) | 22,730 | 7,398
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 238,516 | 323,277
Unrealized Gains | 5,507 | 4,173
Unrealized Losses | (617) | (833)
Fair Value (Estimated) | 243,406 | 326,617
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 37,752 | 25,113
Unrealized Gains | 1,722 | 1,392
Unrealized Losses | 0 | 0
Fair Value (Estimated) | 39,474 | $ 26,505
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,723 |
Unrealized Gains | 43 |
Unrealized Losses | 0 |
Fair Value (Estimated) | $ 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=121645371&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=121645371&loc=d3e27161-111563 + Details
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