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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance $ 20,165 $ 19,287 $ 20,165 $ 19,287 $ 21,030
Recorded investment, with related allowance 11,015 12,905 11,015 12,905 10,721
Recorded Investment 31,180 32,192 31,180 32,192 31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 22,232 20,983 22,232 20,983 22,831
Unpaid principal balance with related allowance 11,601 13,354 11,601 13,354 11,397
Unpaid Principal Balance 33,833 34,337 33,833 34,337 34,228
Related Allowance 1,830 2,205 1,830 2,205 2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 20,795 18,854 20,770 18,433 18,776
Average recorded investment, with related allowance 10,693 13,112 10,646 13,110 13,029
Average Recorded Investment 31,488 31,966 31,416 31,543 31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 188 162 369 308 764
Recognized interest income, with related allowance 42 52 85 115 100
Recognized Interest Income 230 214 454 423 864
Commercial | Real estate          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 7,230 5,438 7,230 5,438 8,718
Recorded investment, with related allowance 1,731 3,470 1,731 3,470 1,042
Recorded Investment 8,961 8,908 8,961 8,908 9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 7,510 5,749 7,510 5,749 9,161
Unpaid principal balance with related allowance 1,742 3,488 1,742 3,488 1,059
Unpaid Principal Balance 9,252 9,237 9,252 9,237 10,220
Related Allowance 196 270 196 270 260
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 7,805 5,169 8,273 4,666 5,536
Average recorded investment, with related allowance 1,677 3,749 1,446 3,819 3,477
Average Recorded Investment 9,482 8,918 9,719 8,485 9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 93 56 183 110 380
Recognized interest income, with related allowance 23 28 49 67 42
Recognized Interest Income 116 84 232 177 422
Commercial | Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 982 1,027 982 1,027 721
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 982 1,027 982 1,027 721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 990 1,027 990 1,027 721
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 990 1,027 990 1,027 721
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 990 837 903 789 762
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 990 837 903 789 762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 11 11 23 21 43
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 11 11 23 21 43
Commercial | Other          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 949 2,265 949 2,265 1,468
Recorded investment, with related allowance 6,633 7,174 6,633 7,174 7,791
Recorded Investment 7,582 9,439 7,582 9,439 9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 978 2,349 978 2,349 1,555
Unpaid principal balance with related allowance 7,022 7,388 7,022 7,388 8,216
Unpaid Principal Balance 8,000 9,737 8,000 9,737 9,771
Related Allowance 1,320 1,647 1,320 1,647 1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 862 2,272 1,034 2,287 2,037
Average recorded investment, with related allowance 6,778 7,170 7,144 7,176 7,471
Average Recorded Investment 7,640 9,442 8,178 9,463 9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 8 11 14 17 32
Recognized interest income, with related allowance 0 0 0 0 5
Recognized Interest Income 8 11 14 17 37
Municipal          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 0 0 0 0
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 0 0 0 0
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 0 0 0 0 0
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 0 0 0
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 0 0 0 0
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 0 0 0 0 0
Residential | Construction          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 0 0 0 0
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 0 0 0 0
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 0 0 0 0 0
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 0 0 0 0
Average recorded investment, with related allowance 0 0 0 0 0
Average Recorded Investment 0 0 0 0 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 0 0 0 0
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 0 0 0 0 0
Residential | Term          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 10,004 9,613 10,004 9,613 9,136
Recorded investment, with related allowance 2,632 2,161 2,632 2,161 1,768
Recorded Investment 12,636 11,774 12,636 11,774 10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 11,689 10,808 11,689 10,808 10,317
Unpaid principal balance with related allowance 2,813 2,378 2,813 2,378 1,998
Unpaid Principal Balance 14,502 13,186 14,502 13,186 12,315
Related Allowance 305 286 305 286 335
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 10,136 9,642 9,571 9,671 9,427
Average recorded investment, with related allowance 2,217 2,086 2,031 2,027 1,982
Average Recorded Investment 12,353 11,728 11,602 11,698 11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 71 80 139 151 289
Recognized interest income, with related allowance 19 24 36 48 53
Recognized Interest Income 90 104 175 199 342
Home equity line of credit          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 1,000 928 1,000 928 972
Recorded investment, with related allowance 19 100 19 100 120
Recorded Investment 1,019 1,028 1,019 1,028 1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 1,065 1,021 1,065 1,021 1,035
Unpaid principal balance with related allowance 24 100 24 100 124
Unpaid Principal Balance 1,089 1,121 1,089 1,121 1,159
Related Allowance 9 2 9 2 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 1,002 918 989 1,004 1,001
Average recorded investment, with related allowance 20 107 24 88 99
Average Recorded Investment 1,022 1,025 1,013 1,092 1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 5 4 10 9 20
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income 5 4 10 9 20
Consumer          
Impaired Financing Receivable, Recorded Investment [Abstract]          
Recorded investment, with no related allowance 0 16 0 16 15
Recorded investment, with related allowance 0 0 0 0 0
Recorded Investment 0 16 0 16 15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]          
Unpaid principal balance, with no related allowance 0 29 0 29 42
Unpaid principal balance with related allowance 0 0 0 0 0
Unpaid Principal Balance 0 29 0 29 42
Related Allowance 0 0 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]          
Average recorded investment, with no related allowance 0 16 0 16 13
Average recorded investment, with related allowance 1 0 1 0 0
Average Recorded Investment 1 16 1 16 13
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]          
Recognized interest income, with no related allowance 0 0 0 0 0
Recognized interest income, with related allowance 0 0 0 0 0
Recognized Interest Income $ 0 $ 0 $ 0 $ 0 $ 0