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Purchased Loans - Impact of Modifications Classified as Restructured Loans (Details) - Purchased loans $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan
Restructured loans |  |  |  |
Number of Loans | loan |  | 6 | 3 | 13
Pre- Modification Outstanding Recorded Investment |  | $ 3,148 | $ 1,161 | $ 5,262
Post- Modification Outstanding Recorded Investment |  | $ 2,888 | $ 1,161 | $ 4,896
Commercial, financial, agricultural |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  | 1 | 1
Pre- Modification Outstanding Recorded Investment |  |  | $ 135 | $ 1,029
Post- Modification Outstanding Recorded Investment |  |  | $ 135 | $ 1,031
Real estate – 1-4 family mortgage: |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  |  | 5
Pre- Modification Outstanding Recorded Investment |  |  |  | $ 493
Post- Modification Outstanding Recorded Investment |  |  |  | $ 389
Real estate – 1-4 family mortgage: | Primary |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan | 1 | 2 | 2 | 4
Pre- Modification Outstanding Recorded Investment | $ 164 | $ 44 | $ 1,026 | $ 334
Post- Modification Outstanding Recorded Investment | $ 164 | $ 44 | $ 1,026 | $ 227
Real estate – 1-4 family mortgage: | Home equity |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  |  | 1
Pre- Modification Outstanding Recorded Investment |  |  |  | $ 159
Post- Modification Outstanding Recorded Investment |  |  |  | $ 162
Real estate – commercial mortgage: |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  |  | 6
Pre- Modification Outstanding Recorded Investment |  |  |  | $ 3,715
Post- Modification Outstanding Recorded Investment |  |  |  | $ 3,457
Real estate – commercial mortgage: | Owner-occupied |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  | 4 |  | 5
Pre- Modification Outstanding Recorded Investment |  | $ 3,104 |  | $ 3,173
Post- Modification Outstanding Recorded Investment |  | $ 2,844 |  | $ 2,913
Real estate – commercial mortgage: | Non-owner occupied |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  |  | 1
Pre- Modification Outstanding Recorded Investment |  |  |  | $ 542
Post- Modification Outstanding Recorded Investment |  |  |  | $ 544
Installment loans to individuals |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  |  | 1
Pre- Modification Outstanding Recorded Investment |  |  |  | $ 25
Post- Modification Outstanding Recorded Investment |  |  |  | $ 19

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- Definition Troubled Debt Restructuring Financing Receivable Modifications [Abstract] + References No definition available. + Details
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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=123577603&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=123577603&loc=SL6953676-111524 + Details
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