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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 651,699	$ 628,066	$ 596,365
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,673	3,444	1,251
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	66,386	63,885	51,751
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	129,360	129,105	118,779
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	294,329	275,268	285,946
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	122,412	117,841	100,073
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	4,840	8,695	5,014
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	30,576	29,705	33,428
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	123	123
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	357,760	353,243	339,306
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	34,231	27,304	43,813
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	205,462	196,391	177,783
Commercial | 1 Strong | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 1 Strong | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 1 Strong | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,630	3,444	1,251
Commercial | 2 Above Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	10,097	10,484	12,308
Commercial | 2 Above Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	36	37	40
Commercial | 2 Above Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	4,447	4,564	5,528
Commercial | 3 Satisfactory | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	82,595	80,266	74,612
Commercial | 3 Satisfactory | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,352	2,231	4,776
Commercial | 3 Satisfactory | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	43,963	46,090	38,738
Commercial | 4 Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	179,290	172,597	183,675
Commercial | 4 Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	23,267	18,780	21,585
Commercial | 4 Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	89,825	82,081	79,751
Commercial | 5 Watch | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	63,503	66,325	46,918
Commercial | 5 Watch | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	8,290	5,970	17,412
Commercial | 5 Watch | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	50,619	45,546	35,743
Commercial | 6 OAEM | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,847	6,890	3,148
Commercial | 6 OAEM | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 6 OAEM | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,993	1,805	1,866
Commercial | 7 Substandard | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	19,305	16,558	18,522
Commercial | 7 Substandard | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	286	286	0
Commercial | 7 Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	10,985	12,861	14,906
Commercial | 8 Doubtful | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	123	123
Commercial | 8 Doubtful | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 8 Doubtful | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	54,246	51,128	35,463
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	43	0	0
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	51,806	48,800	33,875
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	450	518	653
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,947	1,810	935
Municipal | 5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 0	$ 0	$ 0

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