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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | $ 21,030 | $ 18,023 | $ 19,716
Recorded Investment, With Related Allowance | 10,721 | 13,369 | 7,867
Balance of impaired loans | 31,751 | 31,392 | 27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 22,831 | 19,775 | 21,853
Unpaid Principal Balance, With Related Allowance | 11,397 | 13,698 | 8,116
Unpaid Principal Balance | 34,228 | 33,473 | 29,969
Related Allowance | 2,308 | 1,812 | 974
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 18,776 | 19,227 | 19,605
Average Recorded Investment, With Related Allowance | 13,029 | 9,881 | 8,612
Average Recorded Investment | 31,805 | 29,108 | 28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 764 | 553 | 781
Recognized Interest Income, With Related Allowance | 100 | 231 | 323
Recognized Interest Income | 864 | 784 | 1,104
Commercial | Real Estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 8,718 | 3,791 | 5,201
Recorded Investment, With Related Allowance | 1,042 | 3,999 | 4,820
Balance of impaired loans | 9,760 | 7,790 | 10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 9,161 | 3,996 | 5,614
Unpaid Principal Balance, With Related Allowance | 1,059 | 4,116 | 4,925
Unpaid Principal Balance | 10,220 | 8,112 | 10,539
Related Allowance | 260 | 224 | 505
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 5,536 | 5,124 | 6,252
Average Recorded Investment, With Related Allowance | 3,477 | 4,460 | 4,153
Average Recorded Investment | 9,013 | 9,584 | 10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 380 | 164 | 220
Recognized Interest Income, With Related Allowance | 42 | 152 | 186
Recognized Interest Income | 422 | 316 | 406
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 721 | 741 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 763
Balance of impaired loans | 721 | 741 | 763
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 721 | 741 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 763
Unpaid Principal Balance | 721 | 741 | 763
Related Allowance | 0 | 0 | 100
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 762 | 62 | 32
Average Recorded Investment, With Related Allowance | 0 | 699 | 816
Average Recorded Investment | 762 | 761 | 848
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 43 | 38 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 36
Recognized Interest Income | 43 | 38 | 36
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,468 | 2,591 | 1,671
Recorded Investment, With Related Allowance | 7,791 | 7,327 | 72
Balance of impaired loans | 9,259 | 9,918 | 1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,555 | 2,671 | 1,852
Unpaid Principal Balance, With Related Allowance | 8,216 | 7,371 | 72
Unpaid Principal Balance | 9,771 | 10,042 | 1,924
Related Allowance | 1,696 | 1,309 | 39
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 2,037 | 1,908 | 1,074
Average Recorded Investment, With Related Allowance | 7,471 | 2,584 | 317
Average Recorded Investment | 9,508 | 4,492 | 1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 32 | 36 | 86
Recognized Interest Income, With Related Allowance | 5 | 0 | 0
Recognized Interest Income | 37 | 36 | 86
Municipal |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 0 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 0 | 0 | 0
Average Recorded Investment, With Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 0 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 0 | 0 | 0
Average Recorded Investment, With Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential | Term |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 9,136 | 9,769 | 11,483
Recorded Investment, With Related Allowance | 1,768 | 1,979 | 2,186
Balance of impaired loans | 10,904 | 11,748 | 13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 10,317 | 10,909 | 12,654
Unpaid Principal Balance, With Related Allowance | 1,998 | 2,144 | 2,328
Unpaid Principal Balance | 12,315 | 13,053 | 14,982
Related Allowance | 335 | 255 | 304
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 9,427 | 10,770 | 11,025
Average Recorded Investment, With Related Allowance | 1,982 | 2,106 | 3,209
Average Recorded Investment | 11,409 | 12,876 | 14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 289 | 297 | 442
Recognized Interest Income, With Related Allowance | 53 | 79 | 101
Recognized Interest Income | 342 | 376 | 543
Home Equity LIne of Credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 972 | 1,115 | 1,361
Recorded Investment, With Related Allowance | 120 | 64 | 26
Balance of impaired loans | 1,092 | 1,179 | 1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,035 | 1,429 | 1,733
Unpaid Principal Balance, With Related Allowance | 124 | 67 | 28
Unpaid Principal Balance | 1,159 | 1,496 | 1,761
Related Allowance | 17 | 24 | 26
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,001 | 1,351 | 1,213
Average Recorded Investment, With Related Allowance | 99 | 32 | 69
Average Recorded Investment | 1,100 | 1,383 | 1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 20 | 18 | 33
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | 20 | 18 | 33
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 15 | 16 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 15 | 16 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 42 | 29 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 42 | 29 | 0
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 13 | 12 | 9
Average Recorded Investment, With Related Allowance | 0 | 0 | 48
Average Recorded Investment | 13 | 12 | 57
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 0

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