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Post-modification balance of TDRs Listed by type of Modification(Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loans, Allowance for Loan Losses and Credit Quality [Abstract] |  |  |
Extended maturity | $ 5,881 | $ 5,044 | $ 2,936
Adjusted interest rate | 0 | 92 |
Combination rate and maturity | 568 | 1,035 | 2,199
Court ordered concession | 1,726 | 1,534 | 977
Total | $ 8,175 | $ 7,705 | $ 6,112

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