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Loans - Impaired Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance $ 20,042 $ 18,603 $ 21,030
Recorded investment, with related allowance 10,526 13,112 10,721
Recorded Investment 30,568 31,715 31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 21,936 20,140 22,831
Unpaid principal balance with related allowance 11,056 13,597 11,397
Unpaid Principal Balance 32,992 33,737 34,228
Related Allowance 2,075 2,206 2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 20,748 18,012 18,776
Average recorded investment, with related allowance 10,601 13,109 13,029
Average Recorded Investment 31,349 31,121 31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 181 146 764
Recognized interest income, with related allowance 43 63 100
Recognized Interest Income 224 209 864
Commercial | Real estate      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 8,391 5,054 8,718
Recorded investment, with related allowance 1,566 3,897 1,042
Recorded Investment 9,957 8,951 9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 8,779 5,269 9,161
Unpaid principal balance with related allowance 1,583 4,002 1,059
Unpaid Principal Balance 10,362 9,271 10,220
Related Allowance 233 254 260
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 8,741 4,163 5,536
Average recorded investment, with related allowance 1,215 3,889 3,477
Average Recorded Investment 9,956 8,052 9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 90 54 380
Recognized interest income, with related allowance 26 39 42
Recognized Interest Income 116 93 422
Commercial | Construction      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,007 741 721
Recorded investment, with related allowance 0 0 0
Recorded Investment 1,007 741 721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1,007 741 721
Unpaid principal balance with related allowance 0 0 0
Unpaid Principal Balance 1,007 741 721
Related Allowance 0 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 817 741 762
Average recorded investment, with related allowance 0 0 0
Average Recorded Investment 817 741 762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 12 10 43
Recognized interest income, with related allowance 0 0 0
Recognized Interest Income 12 10 43
Commercial | Other      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 709 2,281 1,468
Recorded investment, with related allowance 6,944 7,159 7,791
Recorded Investment 7,653 9,440 9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 734 2,360 1,555
Unpaid principal balance with related allowance 7,315 7,324 8,216
Unpaid Principal Balance 8,049 9,684 9,771
Related Allowance 1,485 1,664 1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 1,207 2,302 2,037
Average recorded investment, with related allowance 7,511 7,182 7,471
Average Recorded Investment 8,718 9,484 9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 6 6 32
Recognized interest income, with related allowance 0 0 5
Recognized Interest Income 6 6 37
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]      
Recognized interest income, with 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, 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]      
Recognized interest income, with 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, with no related allowance 8,926 9,594 9,136
Recorded investment, with related allowance 1,993 1,934 1,768
Recorded Investment 10,919 11,528 10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 10,345 10,733 10,317
Unpaid principal balance with related allowance 2,131 2,146 1,998
Unpaid Principal Balance 12,476 12,879 12,315
Related Allowance 348 272 335
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 9,007 9,700 9,427
Average recorded investment, with related allowance 1,845 1,968 1,982
Average Recorded Investment 10,852 11,668 11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 68 71 289
Recognized interest income, with related allowance 17 24 53
Recognized Interest Income 85 95 342
Home equity line of credit      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 1,009 917 972
Recorded investment, with related allowance 21 122 120
Recorded Investment 1,030 1,039 1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 1,071 1,008 1,035
Unpaid principal balance with related allowance 25 125 124
Unpaid Principal Balance 1,096 1,133 1,159
Related Allowance 7 16 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 976 1,090 1,001
Average recorded investment, with related allowance 29 70 99
Average Recorded Investment 1,005 1,160 1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 5 5 20
Recognized interest income, with related allowance 0 0 0
Recognized Interest Income 5 5 20
Consumer      
Impaired Financing Receivable, Recorded Investment [Abstract]      
Recorded investment, with no related allowance 0 16 15
Recorded investment, with related allowance 2 0 0
Recorded Investment 2 16 15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]      
Unpaid principal balance, with no related allowance 0 29 42
Unpaid principal balance with related allowance 2 0 0
Unpaid Principal Balance 2 29 42
Related Allowance 2 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]      
Average recorded investment, with no related allowance 0 16 13
Average recorded investment, with related allowance 1 0 0
Average Recorded Investment 1 16 13
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]      
Recognized interest income, with no related allowance 0 0 0
Recognized interest income, with related allowance 0 0 0
Recognized Interest Income $ 0 $ 0 $ 0