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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 870,332	$ 827,484	$ 708,099
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,732	2,421	4,587
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	60,042	56,546	57,337
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	204,334	199,165	126,405
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	447,239	414,786	363,753
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	138,860	137,026	129,677
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,326	2,988	4,658
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	15,799	14,552	21,682
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	469,974	442,121	382,753
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	53,394	56,565	43,913
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	297,488	285,015	237,896
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	1,716	2,402	4,559
Commercial | 2 Above Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	7,663	5,938	10,222
Commercial | 2 Above Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	187	2,343	842
Commercial | 2 Above Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	4,560	6,326	5,933
Commercial | 3 Satisfactory |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	94,014	91,475	83,905
Commercial | 3 Satisfactory |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,837	2,889	1,873
Commercial | 3 Satisfactory |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	107,116	104,432	40,255
Commercial | 4 Average |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	279,879	261,539	203,263
Commercial | 4 Average |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	37,779	31,221	26,029
Commercial | 4 Average |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	128,120	120,570	131,664
Commercial | 5 Watch |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	77,299	72,840	68,618
Commercial | 5 Watch |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,375	19,893	14,702
Commercial | 5 Watch |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	49,186	44,293	46,357
Commercial | 6 OAEM |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,261	2,754	1,834
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	65	234	2,824
Commercial | 7 Substandard |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	8,858	7,575	14,911
Commercial | 7 Substandard |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	216	219	467
Commercial | 7 Substandard |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,725	6,758	6,304
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	49,476	43,783	43,537
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	16	19	28
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	47,632	41,939	40,340
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	367	369	372
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,461	1,456	2,797
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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