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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 9,908	$ 10,196	$ 10,344	$ 11,644	$ 11,655	$ 11,514
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,307		1,803	3,146
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,972		3,282	2,932
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,765		3,597	3,639
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,864		1,662	1,927
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,943	3,117	3,532	4,236	4,500	4,602
Commercial real estate | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	225		346	1,150
Commercial real estate | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,017		1,444	1,246
Commercial real estate | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,701		1,742	1,840
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	705	807	823	700	590	575
Commercial construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	275		413	487
Commercial construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	161		186	86
Commercial construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	269		224	127
Commercial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,671	1,714	1,505	2,143	2,241	2,276
Commercial other | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	275		129	830
Commercial other | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	522		624	530
Commercial other | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	874		752	783
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16	16	15	16	15	15
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			0	0
Municipal | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			0	0
Municipal | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16		15	16
Residential term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,184	1,108	1,185	1,264	1,232	1,099
Residential term | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	501		519	606
Residential term | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	303		297	288
Residential term | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	380		369	370
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	27	23	20	23	22	21
Residential construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	12		9	10
Residential construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	15		11	13
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	918	1,044	1,060	753	708	675
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	31		396	73
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	584		376	389
Home equity line of credit | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	303		288	291
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	580	526	542	582	517	573
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Consumer | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	373		346	383
Consumer | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	207		196	199
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,864	$ 1,841	1,662	1,927	$ 1,830	$ 1,678
Unallocated | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,864		$ 1,662	$ 1,927

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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