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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, 2017 USD ($) loan | Sep. 30, 2016 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2016 USD ($) loan
Restructured loans |  |  |  |
Number of Loans | loan | 19 | 2 | 31 | 8
Pre- Modification Outstanding Recorded Investment | $ 2,017 | $ 132 | $ 6,640 | $ 495
Post- Modification Outstanding Recorded Investment | $ 1,433 | $ 120 | $ 5,087 | $ 406
Real estate – 1-4 family mortgage |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan | 18 | 2 | 28 | 7
Pre- Modification Outstanding Recorded Investment | $ 1,624 | $ 132 | $ 3,789 | $ 412
Post- Modification Outstanding Recorded Investment | $ 1,189 | $ 120 | $ 3,062 | $ 325
Real estate – commercial mortgage |  |  |  |
Restructured loans |  |  |  |
Number of Loans | loan | 1 |  | 3 | 1
Pre- Modification Outstanding Recorded Investment | $ 393 |  | $ 2,851 | $ 83
Post- Modification Outstanding Recorded Investment | $ 244 |  | $ 2,025 | $ 81

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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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