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Securities, Amortized Cost and Fair Value of Securities Held-to-maturity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | $ 10,020 | $ 12,033 |
Gross Unrealized Gains | 324 | 372 |
Gross Unrecognized Losses | 0 | (1) |
Estimated Fair Value | 10,344 | 12,404 |
Unrealized Losses and Other-than-temporary Impairment [Abstract] |  |  |
Proceeds from sale of debt securities | 0 | 0 | $ 0
Debt securities | 83,344 | 78,418 |
Other than temporary impairment losses | 0 | 0 |
Obligations of States and Political Subdivisions [Member] |  |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | 10,018 | 12,031 |
Gross Unrealized Gains | 324 | 372 |
Gross Unrecognized Losses | 0 | (1) |
Estimated Fair Value | 10,342 | 12,402 |
Agency Mortgage-backed Securities, Residential [Member] |  |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | 2 | 2 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrecognized Losses | 0 | 0 |
Estimated Fair Value | $ 2 | $ 2 |

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- Definition Amount of restricted 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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