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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Schedule of Financing Receivables [Line Items]
Loans	$ 1,004,942	$ 988,638	$ 939,169
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 279,683	$ 269,462	$ 242,021
Percentage of loans receivable, by type	27.80%	27.30%	25.80%
Commercial construction
Schedule of Financing Receivables [Line Items]
Loans	$ 20,138	$ 24,881	$ 34,683
Percentage of loans receivable, by type	2.00%	2.50%	3.70%
Commercial other
Schedule of Financing Receivables [Line Items]
Loans	$ 133,629	$ 128,341	$ 115,455
Percentage of loans receivable, by type	13.30%	13.00%	12.30%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 19,042	$ 19,751	$ 26,277
Percentage of loans receivable, by type	1.90%	2.00%	2.80%
Residential term
Schedule of Financing Receivables [Line Items]
Loans	$ 405,495	$ 403,030	$ 383,869
Percentage of loans receivable, by type	40.30%	40.70%	40.80%
Residential construction
Schedule of Financing Receivables [Line Items]
Loans	$ 11,754	$ 8,451	$ 13,036
Percentage of loans receivable, by type	1.20%	0.90%	1.40%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 110,249	$ 110,202	$ 104,100
Percentage of loans receivable, by type	11.00%	11.10%	11.10%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 24,952	$ 24,520	$ 19,728
Percentage of loans receivable, by type	2.50%	2.50%	2.10%

X

- Definition

Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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