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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