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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | $ 19,716 | $ 20,889 | $ 26,313
Recorded Investment, With Related Allowance | 7,867 | 8,642 | 9,549
Balance of impaired loans | 27,583 | 29,531 | 35,862
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 21,853 | 22,947 | 29,077
Unpaid Principal Balance, With Related Allowance | 8,116 | 8,959 | 9,949
Unpaid Principal Balance | 29,969 | 31,906 | 39,026
Related Allowance | 974 | 754 | 1,803
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 19,605 | 22,808 | 26,926
Average Recorded Investment, With Related Allowance | 8,612 | 9,890 | 11,478
Average Recorded Investment | 28,217 | 32,698 | 38,404
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 781 | 839 | 1,078
Recorded Interest Income, With Related Allowance | 323 | 381 | 387
Recorded Interest Income | 1,104 | 1,220 | 1,465
Commercial | Real Estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 5,201 | 7,173 | 11,687
Recorded Investment, With Related Allowance | 4,820 | 3,544 | 1,617
Balance of impaired loans | 10,021 | 10,717 | 13,304
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 5,614 | 7,496 | 12,423
Unpaid Principal Balance, With Related Allowance | 4,925 | 3,627 | 1,789
Unpaid Principal Balance | 10,539 | 11,123 | 14,212
Related Allowance | 505 | 89 | 346
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 6,252 | 8,990 | 11,080
Average Recorded Investment, With Related Allowance | 4,153 | 3,066 | 3,040
Average Recorded Investment | 10,405 | 12,056 | 14,120
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 220 | 301 | 488
Recorded Interest Income, With Related Allowance | 186 | 149 | 62
Recorded Interest Income | 406 | 450 | 550
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 30 | 0
Recorded Investment, With Related Allowance | 763 | 996 | 1,380
Balance of impaired loans | 763 | 1,026 | 1,380
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 30 | 0
Unpaid Principal Balance, With Related Allowance | 763 | 996 | 1,380
Unpaid Principal Balance | 763 | 1,026 | 1,380
Related Allowance | 100 | 302 | 413
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 32 | 3 | 30
Average Recorded Investment, With Related Allowance | 816 | 1,153 | 1,279
Average Recorded Investment | 848 | 1,156 | 1,309
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 0 | 1 | 0
Recorded Interest Income, With Related Allowance | 36 | 44 | 56
Recorded Interest Income | 36 | 45 | 56
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,671 | 1,163 | 2,616
Recorded Investment, With Related Allowance | 72 | 71 | 326
Balance of impaired loans | 1,743 | 1,234 | 2,942
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,852 | 1,210 | 3,407
Unpaid Principal Balance, With Related Allowance | 72 | 77 | 338
Unpaid Principal Balance | 1,924 | 1,287 | 3,745
Related Allowance | 39 | 8 | 129
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,074 | 1,893 | 3,853
Average Recorded Investment, With Related Allowance | 317 | 256 | 1,103
Average Recorded Investment | 1,391 | 2,149 | 4,956
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 86 | 76 | 156
Recorded Interest Income, With Related Allowance | 0 | 5 | 13
Recorded Interest Income | 86 | 81 | 169
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] |  |  |
Recorded Interest Income, No Related Allowance | 0 | 0 | 0
Recorded Interest Income, With Related Allowance | 0 | 0 | 0
Recorded 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] |  |  |
Recorded Interest Income, No Related Allowance | 0 | 0 | 0
Recorded Interest Income, With Related Allowance | 0 | 0 | 0
Recorded Interest Income | 0 | 0 | 0
Residential | Term |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 11,483 | 11,122 | 10,820
Recorded Investment, With Related Allowance | 2,186 | 3,966 | 5,303
Balance of impaired loans | 13,669 | 15,088 | 16,123
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 12,654 | 12,157 | 11,824
Unpaid Principal Balance, With Related Allowance | 2,328 | 4,193 | 5,513
Unpaid Principal Balance | 14,982 | 16,350 | 17,337
Related Allowance | 304 | 326 | 519
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 11,025 | 10,480 | 10,505
Average Recorded Investment, With Related Allowance | 3,209 | 5,228 | 5,738
Average Recorded Investment | 14,234 | 15,708 | 16,243
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 442 | 415 | 402
Recorded Interest Income, With Related Allowance | 101 | 180 | 239
Recorded Interest Income | 543 | 595 | 641
Home Equity LIne of Credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,361 | 1,401 | 1,164
Recorded Investment, With Related Allowance | 26 | 65 | 923
Balance of impaired loans | 1,387 | 1,466 | 2,087
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,733 | 2,054 | 1,395
Unpaid Principal Balance, With Related Allowance | 28 | 66 | 929
Unpaid Principal Balance | 1,761 | 2,120 | 2,324
Related Allowance | 26 | 29 | 396
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,213 | 1,400 | 1,447
Average Recorded Investment, With Related Allowance | 69 | 187 | 318
Average Recorded Investment | 1,282 | 1,587 | 1,765
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 33 | 43 | 29
Recorded Interest Income, With Related Allowance | 0 | 3 | 17
Recorded Interest Income | 33 | 46 | 46
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 26
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 26
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 0 | 0 | 28
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 28
Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 9 | 42 | 11
Average Recorded Investment, With Related Allowance | 48 | 0 | 0
Average Recorded Investment | 57 | 42 | 11
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recorded Interest Income, No Related Allowance | 0 | 3 | 3
Recorded Interest Income, With Related Allowance | 0 | 0 | 0
Recorded Interest Income | $ 0 | $ 3 | $ 3

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