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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,071,526	$ 988,638	$ 917,564
Percentage of loans receivable	100.00%	100.00%
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 302,506	$ 269,462	242,311
Percentage of loans receivable	28.20%	27.30%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 25,406	$ 24,881	30,932
Percentage of loans receivable	2.40%	2.50%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 150,769	$ 128,341	104,531
Percentage of loans receivable	14.10%	13.00%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 27,056	$ 19,751	20,424
Percentage of loans receivable	2.50%	2.00%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 18,303	$ 8,451	12,160
Percentage of loans receivable	1.70%	0.90%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 411,469	$ 403,030	384,032
Percentage of loans receivable	38.40%	40.70%
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 110,907	$ 110,202	103,521
Percentage of loans receivable	10.40%	11.10%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 25,110	$ 24,520	$ 19,653
Percentage of loans receivable	2.30%	2.50%

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- 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.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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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