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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	$ 628,066	$ 576,784
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	353,243	323,809
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	27,304	38,056
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	196,391	181,528
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	51,128	33,391
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	3,444	1,586
1 Strong | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	0	0
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	3,444	1,586
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	63,885	51,023
2 Above average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	10,484	12,534
2 Above average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	37	40
2 Above average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	4,564	5,776
2 Above average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	48,800	32,673
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	129,105	115,624
3 Satisfactory | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	80,266	73,899
3 Satisfactory | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	2,231	2,856
3 Satisfactory | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	46,090	38,151
3 Satisfactory | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	518	718
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	275,268	280,762
4 Average | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	172,597	173,956
4 Average | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	18,780	22,446
4 Average | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	82,081	84,360
4 Average | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	1,810	0
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	117,841	88,300
5 Watch | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	66,325	41,652
5 Watch | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	5,970	12,714
5 Watch | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	45,546	33,934
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	8,695	6,207
6 OAEM | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	6,890	3,442
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	1,805	2,765
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	29,705	33,159
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	16,558	18,203
8 Doubtful | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	286	0
8 Doubtful | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	12,861	14,956
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	123
8 Doubtful | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Risk rated loans receivable	123	123
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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