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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,641	$ 11,644	$ 11,514	$ 12,457	$ 12,670	$ 12,500
Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,843		2,461	2,845
General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,135		3,906	4,234
Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,550		3,469	3,834
Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,113		1,678	1,544
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	4,221	4,236	4,602	5,803	5,811	5,865
Commercial Real Estate Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,041		890	1,535
Commercial Real Estate Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,409		1,927	2,231
Commercial Real Estate Portfolio Segment [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,771		1,785	2,037
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	767	700	575	609	591	1,359
Commercial Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	411		272	269
Commercial Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	158		157	178
Commercial Construction [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	198		146	162
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,942	2,143	2,276	2,269	2,572	2,050
Commercial Other [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	660		841	807
Commercial Other [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	568		745	764
Commercial Other [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	714		690	698
Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	15	16	15	16	18	18
Municipal [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			0	0
Municipal [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses			0	0
Municipal [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	15		15	16
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,320	1,264	1,099	982	1,026	1,109
Residential Term [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	661		404	228
Residential Term [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	296		342	360
Residential Term [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	363		353	394
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	20	23	21	15	9	11
Residential Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	9		10	7
Residential Construction [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	11		11	8
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	735	753	675	666	737	654
Home Equity [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	70		54	6
Home Equity [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	381		343	352
Home Equity [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	284		278	308
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	508	582	573	553	631	592
Consumer Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Consumer Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	314		382	342
Consumer Portfolio Segment [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	194		191	211
Unallocated Financing Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,113	1,927	1,678	1,544	1,275	842
Unallocated Financing Receivables [Member] | Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 2,113		$ 1,678	$ 1,544

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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