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