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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) loan	Sep. 30, 2015 USD ($) loan	Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	75	88	84
Balance	$ 22,025	$ 24,715	$ 23,923
Specific Reserves	$ 492	$ 524	$ 455
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	11	16	15
Balance	$ 9,221	$ 10,696	$ 10,350
Specific Reserves	$ 116	$ 69	$ 85
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	1	1	1
Balance	$ 788	$ 788	$ 788
Specific Reserves	$ 99	$ 76	$ 94
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	7	13	11
Balance	$ 841	$ 1,621	$ 1,168
Specific Reserves	$ 5	$ 1	$ 1
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	53	53	53
Balance	$ 10,626	$ 10,837	$ 10,875
Specific Reserves	$ 272	$ 378	$ 275
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	3	5	4
Balance	$ 549	$ 773	$ 742
Specific Reserves	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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