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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) loan	Mar. 31, 2016 USD ($) loan	Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	70	82	71
Balance	$ 21,121	$ 23,628	$ 21,526
Specific Reserves	$ 386	$ 436	$ 736
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	10	14	10
Balance	$ 8,703	$ 10,133	$ 8,937
Specific Reserves	$ 82	$ 65	$ 375
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	1	1	1
Balance	$ 763	$ 788	$ 763
Specific Reserves	$ 101	$ 96	$ 100
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	5	10	5
Balance	$ 772	$ 1,116	$ 779
Specific Reserves	$ 2	$ 0	$ 0
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	51	53	52
Balance	$ 10,344	$ 10,856	$ 10,503
Specific Reserves	$ 201	$ 275	$ 261
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loan) | loan	3	4	3
Balance	$ 539	$ 735	$ 544
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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+ References

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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