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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