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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, 2018 loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan
Restructured loans |  |  |  |
Number of Loans | loan | 0 | 19 | 3 | 31
Pre- Modification Outstanding Recorded Investment |  | $ 2,017 | $ 74 | $ 6,640
Post- Modification Outstanding Recorded Investment |  | $ 1,433 | $ 68 | $ 5,087
Commercial, financial, agricultural |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  | 1 |
Pre- Modification Outstanding Recorded Investment |  |  | $ 48 |
Post- Modification Outstanding Recorded Investment |  |  | $ 44 |
Real estate – 1-4 family mortgage |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  | 18 | 1 | 28
Pre- Modification Outstanding Recorded Investment |  | $ 1,624 | $ 18 | $ 3,789
Post- Modification Outstanding Recorded Investment |  | $ 1,189 | $ 17 | $ 3,062
Real estate – commercial mortgage |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  | 1 | 1 | 3
Pre- Modification Outstanding Recorded Investment |  | $ 393 | $ 8 | $ 2,851
Post- Modification Outstanding Recorded Investment |  | $ 244 | $ 7 | $ 2,025

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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