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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | $ 8,968 | $ 12,098 | $ 18,212
Recorded Investment, With Related Allowance | 3,084 | 3,941 | 11,062
Balance of impaired loans | 12,052 | 16,039 | 29,274
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 10,453 | 13,806 | 20,330
Unpaid Principal Balance, With Related Allowance | 3,307 | 4,036 | 11,848
Unpaid Principal Balance | 13,760 | 17,842 | 32,178
Related Allowance | 576 | 462 | 2,213
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 9,553 | 15,473 | 20,542
Average Recorded Investment, With Related Allowance | 3,568 | 5,615 | 11,015
Average Recorded Investment | 13,121 | 21,088 | 31,557
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 166 | 336 | 593
Recognized Interest Income, With Related Allowance | 76 | 142 | 142
Recognized Interest Income | 242 | 478 | 735
Commercial | Real estate |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 1,386 | 2,060 | 5,235
Recorded Investment, With Related Allowance | 42 | 969 | 1,074
Balance of impaired loans | 1,428 | 3,029 | 6,309
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,689 | 2,368 | 5,492
Unpaid Principal Balance, With Related Allowance | 71 | 995 | 1,093
Unpaid Principal Balance | 1,760 | 3,363 | 6,585
Related Allowance | 42 | 112 | 251
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,590 | 4,123 | 7,611
Average Recorded Investment, With Related Allowance | 614 | 1,018 | 1,528
Average Recorded Investment | 2,204 | 5,141 | 9,139
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 63 | 127 | 228
Recognized Interest Income, With Related Allowance | 0 | 43 | 60
Recognized Interest Income | 63 | 170 | 288
Commercial | Construction |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 28 | 89 | 958
Recorded Investment, With Related Allowance | 661 | 681 | 0
Balance of impaired loans | 689 | 770 | 958
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 28 | 89 | 970
Unpaid Principal Balance, With Related Allowance | 661 | 681 | 0
Unpaid Principal Balance | 689 | 770 | 970
Related Allowance | 16 | 18 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 22 | 358 | 936
Average Recorded Investment, With Related Allowance | 661 | 579 | 0
Average Recorded Investment | 683 | 937 | 936
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 47
Recognized Interest Income, With Related Allowance | 22 | 30 | 0
Recognized Interest Income | 22 | 30 | 47
Commercial | Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 917 | 1,591 | 756
Recorded Investment, With Related Allowance | 386 | 188 | 6,319
Balance of impaired loans | 1,303 | 1,779 | 7,075
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 1,009 | 1,623 | 786
Unpaid Principal Balance, With Related Allowance | 411 | 202 | 6,925
Unpaid Principal Balance | 1,420 | 1,825 | 7,711
Related Allowance | 381 | 169 | 1,273
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 1,051 | 999 | 965
Average Recorded Investment, With Related Allowance | 396 | 1,193 | 6,778
Average Recorded Investment | 1,447 | 2,192 | 7,743
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 15 | 15 | 29
Recognized Interest Income, With Related Allowance | 0 | 3 | 0
Recognized Interest Income | 15 | 18 | 29
Municipal |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, 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, 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, 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, No Related Allowance | 0 | 0 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 0
Balance of impaired loans | 0 | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, 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, 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, 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, No Related Allowance | 6,178 | 7,335 | 10,176
Recorded Investment, With Related Allowance | 1,995 | 2,079 | 2,263
Balance of impaired loans | 8,173 | 9,414 | 12,439
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 7,238 | 8,629 | 11,931
Unpaid Principal Balance, With Related Allowance | 2,164 | 2,134 | 2,412
Unpaid Principal Balance | 9,402 | 10,763 | 14,343
Related Allowance | 137 | 163 | 237
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 6,429 | 8,773 | 10,033
Average Recorded Investment, With Related Allowance | 1,897 | 2,073 | 2,424
Average Recorded Investment | 8,326 | 10,846 | 12,457
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 87 | 193 | 269
Recognized Interest Income, With Related Allowance | 54 | 65 | 82
Recognized Interest Income | 141 | 258 | 351
Home equity line of credit |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 457 | 1,015 | 1,087
Recorded Investment, With Related Allowance | 0 | 24 | 1,401
Balance of impaired loans | 457 | 1,039 | 2,488
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 487 | 1,089 | 1,151
Unpaid Principal Balance, With Related Allowance | 0 | 24 | 1,412
Unpaid Principal Balance | 487 | 1,113 | 2,563
Related Allowance | 0 | 0 | 447
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 461 | 1,219 | 997
Average Recorded Investment, With Related Allowance | 0 | 744 | 283
Average Recorded Investment | 461 | 1,963 | 1,280
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 0 | 0 | 20
Recognized Interest Income, With Related Allowance | 0 | 1 | 0
Recognized Interest Income | 0 | 1 | 20
Consumer |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Recorded Investment, No Related Allowance | 2 | 8 | 0
Recorded Investment, With Related Allowance | 0 | 0 | 5
Balance of impaired loans | 2 | 8 | 5
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Unpaid Principal Balance, No Related Allowance | 2 | 8 | 0
Unpaid Principal Balance, With Related Allowance | 0 | 0 | 6
Unpaid Principal Balance | 2 | 8 | 6
Related Allowance | 0 | 0 | 5
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment, No Related Allowance | 0 | 1 | 0
Average Recorded Investment, With Related Allowance | 0 | 8 | 2
Average Recorded Investment | 0 | 9 | 2
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Recognized Interest Income, No Related Allowance | 1 | 1 | 0
Recognized Interest Income, With Related Allowance | 0 | 0 | 0
Recognized Interest Income | $ 1 | $ 1 | $ 0

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