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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 576,784	$ 505,737
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	323,809	302,506
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,056	25,406
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	181,528	150,769
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	33,391	27,056
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,586	852
1 Strong | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	2
1 Strong | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
1 Strong | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,586	850
1 Strong | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
2 Above average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	51,023	48,491
2 Above average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,534	13,981
2 Above average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	40	49
2 Above average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,776	8,934
2 Above average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	32,673	25,527
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	115,624	132,372
3 Satisfactory | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	73,899	81,286
3 Satisfactory | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,856	1,345
3 Satisfactory | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	38,151	48,212
3 Satisfactory | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	718	1,529
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	280,762	221,073
4 Average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	173,956	139,421
4 Average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	22,446	16,506
4 Average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	84,360	65,146
4 Average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	88,300	67,394
5 Watch | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	41,652	43,181
5 Watch | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,714	7,349
5 Watch | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	33,934	16,864
5 Watch | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,207	6,156
6 OAEM | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,442	4,569
6 OAEM | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
6 OAEM | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,765	1,587
6 OAEM | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	33,159	29,399
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	18,203	20,066
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	157
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	14,956	9,176
8 Doubtful | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	123	0
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	123	0
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
8 Doubtful | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 0	$ 0

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