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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan	Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	82	90	84
Balance	$ 23,628	$ 26,524	$ 23,923
Specific Reserves	$ 436	$ 695	$ 455
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	14	17	15
Balance	$ 10,133	$ 11,831	$ 10,350
Specific Reserves	$ 65	$ 133	$ 85
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 788	$ 1,172	$ 788
Specific Reserves	$ 96	$ 189	$ 94
Commercial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	10	13	11
Balance	$ 1,116	$ 1,789	$ 1,168
Specific Reserves	$ 0	$ 0	$ 1
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | 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	53	54	53
Balance	$ 10,856	$ 10,917	$ 10,875
Specific Reserves	$ 275	$ 351	$ 275
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	4	5	4
Balance	$ 735	$ 815	$ 742
Specific Reserves	$ 0	$ 22	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | 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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