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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

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