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Loans, Troubled Debt Restructuring with subsequent default (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) contracts | Dec. 31, 2019 USD ($) contracts | Dec. 31, 2018 USD ($) contracts
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 55 | 70 | 73
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 4,401,000 | $ 1,365,000 | $ 1,319,000
Nonaccruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 3,700,000 | 1,000,000.0 | 1,200,000
Accruing Financing Receivable Modifications [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 706,000 | $ 350,000 | $ 86,000
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 4 | 1 | 3
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 2,776,000 | $ 20,000 | $ 104,000
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 1 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 223,000 |  |
Construction Real Estate Remaining Commercial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Construction Real Estate Mortgage [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 |  |
Construction Real Estate Installment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 1 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 14,000 |  |
Residential Real Estate Commercial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 1 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 3,000 |  |
Residential Real Estate Mortgage [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 11 | 7 | 8
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 993,000 | $ 665,000 | $ 518,000
Residential Real Estate Home Equity Line Of Credit [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 6 | 2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | $ 141,000 | $ 32,000
Residential Real Estate Installment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 3 | 0 | 1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 32,000 |  | $ 29,000
Consumer Loan [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 34 | 56 | 59
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 360,000 | $ 539,000 | $ 636,000
Leases |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | contracts | 0 | 0 | 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 0 |  |

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