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Purchased Loans - Restructured Loans by Class (Details) - Purchased $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 13 | 5 | 5
Pre-Modification Outstanding Recorded Investment | $ 5,262 | $ 2,931 | $ 712
Post-Modification Outstanding Recorded Investment | $ 4,896 | $ 2,927 | $ 552
Commercial, financial, agriculture |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 | 2 | 1
Pre-Modification Outstanding Recorded Investment | $ 1,029 | $ 2,778 | $ 48
Post-Modification Outstanding Recorded Investment | $ 1,031 | $ 2,778 | $ 44
Real estate - 1-4 family mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 5 | 2 | 2
Pre-Modification Outstanding Recorded Investment | $ 493 | $ 73 | $ 142
Post-Modification Outstanding Recorded Investment | $ 389 | $ 73 | $ 127
Real estate - 1-4 family mortgage | Primary |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 4 |  |
Pre-Modification Outstanding Recorded Investment | $ 334 |  |
Post-Modification Outstanding Recorded Investment | $ 227 |  |
Real estate - 1-4 family mortgage | Home Equity Loan |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 159 |  |
Post-Modification Outstanding Recorded Investment | $ 162 |  |
Real estate - commercial mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 6 | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 3,715 | $ 80 | $ 522
Post-Modification Outstanding Recorded Investment | $ 3,457 | $ 76 | $ 381
Real estate - commercial mortgage | Owner Occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 5 |  |
Pre-Modification Outstanding Recorded Investment | $ 3,173 |  |
Post-Modification Outstanding Recorded Investment | $ 2,913 |  |
Real estate - commercial mortgage | Non-owner Occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 542 |  |
Post-Modification Outstanding Recorded Investment | $ 544 |  |
Installment loans to individuals |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | loan | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 25 |  |
Post-Modification Outstanding Recorded Investment | $ 19 |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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