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Non Purchased Loans - Restructured Loans by Class (Details) - Non-Purchased $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
Restructured loans |  |  |
Number of Loans (loans) | loan | 14 | 12 | 25
Pre-Modification Outstanding Recorded Investment | $ 1,616 | $ 1,698 | $ 2,753
Post-Modification Outstanding Recorded Investment | $ 1,232 | $ 1,685 | $ 2,434
Commercial, financial, agricultural |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 2 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 331 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 330 | $ 0 | $ 0
Lease financing |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0
Real estate – construction |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 0 | 1 | 0
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 510 | $ 0
Post-Modification Outstanding Recorded Investment | $ 0 | $ 518 | $ 0
Real estate – 1-4 family mortgage |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 8 | 11 | 22
Pre-Modification Outstanding Recorded Investment | $ 598 | $ 1,188 | $ 2,202
Post-Modification Outstanding Recorded Investment | $ 586 | $ 1,167 | $ 2,035
Real estate – commercial mortgage |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 3 | 0 | 2
Pre-Modification Outstanding Recorded Investment | $ 683 | $ 0 | $ 484
Post-Modification Outstanding Recorded Investment | $ 313 | $ 0 | $ 332
Installment loans to individuals |  |  |
Restructured loans |  |  |
Number of Loans (loans) | loan | 1 | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 4 | $ 0 | $ 67
Post-Modification Outstanding Recorded Investment | $ 3 | $ 0 | $ 67

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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