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Purchased Loans - Impact of Modifications Classified as Restructured Loans (Details) - Purchased loans $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan
Restructured loans |  |  |  |
Number of Loans | loan | 1 | 4 | 3 | 18
Pre- Modification Outstanding Recorded Investment | $ 18 | $ 463 | $ 74 | $ 5,405
Post- Modification Outstanding Recorded Investment | $ 17 | $ 367 | $ 68 | $ 4,177
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 | 1 | 4 | 1 | 14
Pre- Modification Outstanding Recorded Investment | $ 18 | $ 463 | $ 18 | $ 2,684
Post- Modification Outstanding Recorded Investment | $ 17 | $ 367 | $ 17 | $ 2,178
Real estate – commercial mortgage |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan |  |  | 1 | 4
Pre- Modification Outstanding Recorded Investment |  |  | $ 8 | $ 2,721
Post- Modification Outstanding Recorded Investment |  |  | $ 7 | $ 1,999

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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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- Definition Pre-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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