Loans, Allowance for Credit Losses and Credit Quality (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	$ 6,765	$ 6,892	$ 7,182	$ 6,853
Allowance for credit losses, charge-offs	0	564	603	1,090
Recoveries	33	265	52	273
Provision	110	679	277	1,236
Ending balance	6,908	7,272	6,908	7,272
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	2,720	1,773	2,720	1,773
Period ending amount: Collectively evaluated for impairment	4,188	5,499	4,188	5,499
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	6,762	6,402	6,762	6,402
Loans collectively evaluated for impairment	291,024	283,979	291,024	283,979
Commercial [Member]
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	1,048	1,886	1,387	1,868
Allowance for credit losses, charge-offs	0	301	32	772
Recoveries	18	5	28	10
Provision	(23)	(187)	(340)	297
Ending balance	1,043	1,403	1,043	1,403
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	444	63	444	63
Period ending amount: Collectively evaluated for impairment	599	1,340	599	1,340
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	1,265	126	1,265	126
Loans collectively evaluated for impairment	45,846	51,219	45,846	51,219
Commercial real estate [Member]
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	3,832	3,054	3,972	3,205
Allowance for credit losses, charge-offs	0	49	0	49
Recoveries	0	0	0	0
Provision	130	1,072	(10)	921
Ending balance	3,962	4,077	3,962	4,077
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	1,198	1,199	1,198	1,199
Period ending amount: Collectively evaluated for impairment	2,764	2,878	2,764	2,878
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	2,683	4,668	2,683	4,668
Loans collectively evaluated for impairment	156,199	136,104	156,199	136,104
Residential [Member]
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	1,602	1,434	1,422	1,257
Allowance for credit losses, charge-offs	0	133	340	133
Recoveries	3	253	4	253
Provision	42	(160)	561	17
Ending balance	1,647	1,394	1,647	1,394
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	1,011	465	1,011	465
Period ending amount: Collectively evaluated for impairment	636	929	636	929
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	2,682	1,526	2,682	1,526
Loans collectively evaluated for impairment	80,858	87,050	80,858	87,050
Consumer [Member]
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	283	518	401	523
Allowance for credit losses, charge-offs	0	81	231	136
Recoveries	12	7	20	10
Provision	(39)	(46)	66	1
Ending balance	256	398	256	398
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	67	46	67	46
Period ending amount: Collectively evaluated for impairment	189	352	189	352
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	132	82	132	82
Loans collectively evaluated for impairment	8,121	9,606	8,121	9,606
Unallocated [Member]
Allowance for credit losses and recorded investment in loans receivable
Beginning balance	0	0	0	0
Allowance for credit losses, charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	0	0	0	0
Ending balance	0	0	0	0
Allowance for credit losses:
Period ending amount: Individually evaluated for impairment	0	0	0	0
Period ending amount: Collectively evaluated for impairment	0	0	0	0
Loans:
Period ending amount: Loans acquired with deteriorating credit quality	0	0	0	0
Loans individually evaluated for impairment	0	0	0	0
Loans collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0