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Purchased Loans - Changes in Restructured Loans (Details) - Purchased $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Number of Loans |  |
Beginning balance (loans) | loan | 42 | 26
Additional loans with concessions (loans) | loan | 36 | 25
Reclassified as nonperforming (loans) | loan | (10) | (4)
Paid in full (loans) | loan | (3) | (5)
Charge-offs (loans) | loan | (1) |
Principal paydowns (loans) | loan | 0 | 0
Lapse of concession period (loans) | loan | (1) |
Reclassified as performing (loans) | loan | (9) |
Ending balance (loans) | loan | 72 | 42
Recorded Investment |  |
Beginning balance | $ | $ 4,028 | $ 3,201
Additional loans with concessions | $ | 5,703 | 2,472
Reclassified as nonperforming | $ | (786) | (216)
Paid in full | $ | (323) | (1,297)
Charge-offs | $ | (17) |
Principal paydowns | $ | (377) | (132)
Lapse of concession period | $ | (101) |
Reclassified as performing | $ | (838) |
Ending balance | $ | $ 8,965 | $ 4,028

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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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