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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance $ 20,235 $ 20,544 $ 19,716
Recorded investment, with related allowance 7,617 8,066 7,867
Recorded Investment 27,852 28,610 27,583
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 22,308 22,651 21,853
Unpaid principal balance with related allowance 7,990 8,427 8,116
Unpaid Principal Balance 30,298 31,078 29,969
Related Allowance 768 599 974
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 19,817 20,490 19,605
Average recorded investment, with related allowance 7,732 8,483 8,612
Average Recorded Investment 27,549 28,973 28,217
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 211 187 781
Interest income, cash basis method, with related allowance 82 88 323
Interest income, cash basis method 293 275 1,104
Commercial | Real estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 5,949 7,381 5,201
Recorded investment, with related allowance 4,722 3,129 4,820
Recorded Investment 10,671 10,510 10,021
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 6,450 7,712 5,614
Unpaid principal balance with related allowance 4,908 3,213 4,925
Unpaid Principal Balance 11,358 10,925 10,539
Related Allowance 351 69 505
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 5,444 7,221 6,252
Average recorded investment, with related allowance 4,741 3,399 4,153
Average Recorded Investment 10,185 10,620 10,405
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 51 79 220
Interest income, cash basis method, with related allowance 46 36 186
Interest income, cash basis method 97 115 406
Commercial | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 179 0
Recorded investment, with related allowance 763 788 763
Recorded Investment 763 967 763
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 0 238 0
Unpaid principal balance with related allowance 763 788 763
Unpaid Principal Balance 763 1,026 763
Related Allowance 101 96 100
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 0 80 32
Average recorded investment, with related allowance 763 926 816
Average Recorded Investment 763 1,006 848
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 0 1 0
Interest income, cash basis method, with related allowance 9 8 36
Interest income, cash basis method 9 9 36
Commercial | Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,476 1,097 1,671
Recorded investment, with related allowance 234 88 72
Recorded Investment 1,710 1,185 1,743
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1,636 1,137 1,852
Unpaid principal balance with related allowance 272 96 72
Unpaid Principal Balance 1,908 1,233 1,924
Related Allowance 39 21 39
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 1,595 1,121 1,074
Average recorded investment, with related allowance 125 80 317
Average Recorded Investment 1,720 1,201 1,391
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 22 8 86
Interest income, cash basis method, with related allowance 4 0 0
Interest income, cash basis method 26 8 86
Municipal      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 0 0
Recorded investment, with related allowance 0 0 0
Recorded Investment 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with 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, with 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]      
Interest income, cash basis method, with no related allowance 0 0 0
Interest income, cash basis method, with related allowance 0 0 0
Interest income, cash basis method 0 0 0
Residential | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 0 0
Recorded investment, with related allowance 0 0 0
Recorded Investment 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with 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, with 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]      
Interest income, cash basis method, with no related allowance 0 0 0
Interest income, cash basis method, with related allowance 0 0 0
Interest income, cash basis method 0 0 0
Residential | Term      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 11,388 10,543 11,483
Recorded investment, with related allowance 1,872 3,997 2,186
Recorded Investment 13,260 14,540 13,669
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 12,470 11,541 12,654
Unpaid principal balance with related allowance 2,020 4,265 2,328
Unpaid Principal Balance 14,490 15,806 14,982
Related Allowance 251 384 304
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 11,402 10,715 11,025
Average recorded investment, with related allowance 2,077 3,995 3,209
Average Recorded Investment 13,479 14,710 14,234
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 129 91 442
Interest income, cash basis method, with related allowance 23 43 101
Interest income, cash basis method 152 134 543
Home equity line of credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,422 1,344 1,361
Recorded investment, with related allowance 26 64 26
Recorded Investment 1,448 1,408 1,387
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1,752 2,023 1,733
Unpaid principal balance with related allowance 27 65 28
Unpaid Principal Balance 1,779 2,088 1,761
Related Allowance 26 29 26
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average Recorded Investment, with no related allowance 1,376 1,353 1,213
Average recorded investment, with related allowance 26 83 69
Average Recorded Investment 1,402 1,436 1,282
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 9 8 33
Interest income, cash basis method, with related allowance 0 1 0
Interest income, cash basis method 9 9 33
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 0 0
Recorded investment, with related allowance 0 0 0
Recorded Investment 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with 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, with no related allowance 0 0 9
Average recorded investment, with related allowance 0 0 48
Average Recorded Investment 0 0 57
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Interest income, cash basis method, with no related allowance 0 0 0
Interest income, cash basis method, with related allowance 0 0 0
Interest income, cash basis method $ 0 $ 0 $ 0