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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | $ 17,836 | $ 20,042 | $ 18,212
Recorded investment, with related allowance | 4,657 | 10,526 | 11,062
Recorded Investment | 22,493 | 30,568 | 29,274
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 19,975 | 21,936 | 20,330
Unpaid principal balance with related allowance | 4,801 | 11,056 | 11,848
Unpaid Principal Balance | 24,776 | 32,992 | 32,178
Related Allowance | 992 | 2,075 | 2,213
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 17,867 | 20,748 | 20,542
Average recorded investment, with related allowance | 8,716 | 10,601 | 11,015
Average Recorded Investment | 26,583 | 31,349 | 31,557
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 121 | 181 | 593
Recognized interest income, with related allowance | 31 | 43 | 142
Recognized Interest Income | 152 | 224 | 735
Commercial | Real estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 5,162 | 8,391 | 5,235
Recorded investment, with related allowance | 1,061 | 1,566 | 1,074
Recorded Investment | 6,223 | 9,957 | 6,309
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 5,421 | 8,779 | 5,492
Unpaid principal balance with related allowance | 1,082 | 1,583 | 1,093
Unpaid Principal Balance | 6,503 | 10,362 | 6,585
Related Allowance | 230 | 233 | 251
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 5,157 | 8,741 | 7,611
Average recorded investment, with related allowance | 1,064 | 1,215 | 1,528
Average Recorded Investment | 6,221 | 9,956 | 9,139
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 47 | 90 | 228
Recognized interest income, with related allowance | 8 | 26 | 60
Recognized Interest Income | 55 | 116 | 288
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 246 | 1,007 | 958
Recorded investment, with related allowance | 701 | 0 | 0
Recorded Investment | 947 | 1,007 | 958
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 265 | 1,007 | 970
Unpaid principal balance with related allowance | 701 | 0 | 0
Unpaid Principal Balance | 966 | 1,007 | 970
Related Allowance | 3 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 717 | 817 | 936
Average recorded investment, with related allowance | 234 | 0 | 0
Average Recorded Investment | 951 | 817 | 936
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 0 | 12 | 47
Recognized interest income, with related allowance | 10 | 0 | 0
Recognized Interest Income | 10 | 12 | 47
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 818 | 709 | 756
Recorded investment, with related allowance | 172 | 6,944 | 6,319
Recorded Investment | 990 | 7,653 | 7,075
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 848 | 734 | 786
Unpaid principal balance with related allowance | 194 | 7,315 | 6,925
Unpaid Principal Balance | 1,042 | 8,049 | 7,711
Related Allowance | 172 | 1,485 | 1,273
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 793 | 1,207 | 965
Average recorded investment, with related allowance | 4,269 | 7,511 | 6,778
Average Recorded Investment | 5,062 | 8,718 | 7,743
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 3 | 6 | 29
Recognized interest income, with related allowance | 0 | 0 | 0
Recognized Interest Income | 3 | 6 | 29
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 | 10,378 | 8,926 | 10,176
Recorded investment, with related allowance | 1,660 | 1,993 | 2,263
Recorded Investment | 12,038 | 10,919 | 12,439
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 12,135 | 10,345 | 11,931
Unpaid principal balance with related allowance | 1,755 | 2,131 | 2,412
Unpaid Principal Balance | 13,890 | 12,476 | 14,343
Related Allowance | 233 | 348 | 237
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 10,015 | 9,007 | 10,033
Average recorded investment, with related allowance | 1,999 | 1,845 | 2,424
Average Recorded Investment | 12,014 | 10,852 | 12,457
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 67 | 68 | 269
Recognized interest income, with related allowance | 13 | 17 | 82
Recognized Interest Income | 80 | 85 | 351
Home equity line of credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 1,232 | 1,009 | 1,087
Recorded investment, with related allowance | 996 | 21 | 1,401
Recorded Investment | 2,228 | 1,030 | 2,488
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 1,306 | 1,071 | 1,151
Unpaid principal balance with related allowance | 1,002 | 25 | 1,412
Unpaid Principal Balance | 2,308 | 1,096 | 2,563
Related Allowance | 296 | 7 | 447
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 1,185 | 976 | 997
Average recorded investment, with related allowance | 1,124 | 29 | 283
Average Recorded Investment | 2,309 | 1,005 | 1,280
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized interest income, with no related allowance | 4 | 5 | 20
Recognized interest income, with related allowance | 0 | 0 | 0
Recognized Interest Income | 4 | 5 | 20
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded investment, with no related allowance | 0 | 0 | 0
Recorded investment, with related allowance | 67 | 2 | 5
Recorded Investment | 67 | 2 | 5
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid principal balance, with no related allowance | 0 | 0 | 0
Unpaid principal balance with related allowance | 67 | 2 | 6
Unpaid Principal Balance | 67 | 2 | 6
Related Allowance | 58 | 2 | 5
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average recorded investment, with no related allowance | 0 | 0 | 0
Average recorded investment, with related allowance | 26 | 1 | 2
Average Recorded Investment | 26 | 1 | 2
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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