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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 952,116	$ 827,484	$ 812,573
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,442	2,421	2,274
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	55,326	56,546	57,742
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	174,474	199,165	228,052
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	558,911	414,786	367,869
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	142,683	137,026	133,695
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,931	2,988	3,319
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	14,349	14,552	19,622
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	550,077	442,121	407,128
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	73,302	56,565	52,038
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	288,121	285,015	309,297
Commercial | 1 Strong |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 1 Strong |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 1 Strong |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,434	2,402	2,251
Commercial | 2 Above Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	9,220	5,938	8,492
Commercial | 2 Above Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	175	2,343	1,627
Commercial | 2 Above Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	7,144	6,326	5,361
Commercial | 3 Satisfactory |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	92,596	91,475	84,178
Commercial | 3 Satisfactory |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,831	2,889	3,145
Commercial | 3 Satisfactory |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	79,693	104,432	140,360
Commercial | 4 Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	355,252	261,539	230,954
Commercial | 4 Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	47,003	31,221	27,907
Commercial | 4 Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	155,189	120,570	107,552
Commercial | 5 Watch |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	79,885	72,840	68,565
Commercial | 5 Watch |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	24,293	19,893	18,919
Commercial | 5 Watch |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,505	44,293	46,211
Commercial | 6 OAEM |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,899	2,754	2,028
Commercial | 6 OAEM |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 6 OAEM |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	32	234	1,291
Commercial | 7 Substandard |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	9,225	7,575	12,911
Commercial | 7 Substandard |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	219	440
Commercial | 7 Substandard |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,124	6,758	6,271
Commercial | 8 Doubtful |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 8 Doubtful |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Commercial | 8 Doubtful |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	40,616	43,783	44,110
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	8	19	23
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,787	41,939	42,262
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	354	369	369
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,467	1,456	1,456
Municipal | 5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0	0
Municipal | 8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 0	$ 0	$ 0

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