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Loans and Allowance for Credit Losses - Restructured Loans that are Considered to be in Default (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Residential Portfolio Segment [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan | 1 | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 34 | $ 0 | $ 49
Loans To Individuals [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan | 2 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 74 | $ 0 | $ 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan | 3 | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 108 | $ 0 | $ 49
Senior Lien | Residential Real Estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan | 1 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 34 |  |
Automobiles | Loans To Individuals [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan | 2 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ | $ 74 |  |

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524 + Details
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