Allowances for Loan Losses (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Allowance for credit losses [Roll Forward]
Beginning Balance	$ 4,213,000	$ 4,006,000	$ 3,980,000	$ 3,648,000
Charge-offs	(91,000)	(178,000)	(361,000)	(398,000)
Recoveries	36,000	30,000	164,000	83,000
Provisions	275,000	145,000	650,000	670,000
Ending balance	4,433,000	4,003,000	4,433,000	4,003,000
Ending balance: related to loans individually evaluated for impairment	1,032,000	695,000	1,032,000	695,000
Ending balance: related to loans collectively evaluated for impairment	3,401,000	3,308,000	3,401,000	3,308,000
Loans receivable, Ending balance	323,669,000	293,674,000	323,669,000	293,674,000
Ending balance: individually evaluated for impairment	6,780,000	4,098,000	6,780,000	4,098,000
Ending balance: collectively evaluated for impairment	316,889,000	289,576,000	316,889,000	289,576,000
Family first lien residential mortgages 1 to 4 [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	777,000	687,000	664,000	750,000
Charge-offs	(61,000)	(72,000)	(96,000)	(131,000)
Recoveries	23,000	16,000	52,000	49,000
Provisions	27,000	23,000	146,000	(14,000)
Ending balance	766,000	654,000	766,000	654,000
Ending balance: related to loans individually evaluated for impairment	208,000	128,000	208,000	128,000
Ending balance: related to loans collectively evaluated for impairment	558,000	526,000	558,000	526,000
Loans receivable, Ending balance	169,062,000	152,841,000	169,062,000	152,841,000
Ending balance: individually evaluated for impairment	2,134,000	704,000	2,134,000	704,000
Ending balance: collectively evaluated for impairment	166,928,000	152,137,000	166,928,000	152,137,000
Residential mortgage construction [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions	0	0	0	0
Ending balance	0	0	0	0
Ending balance: related to loans individually evaluated for impairment	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	0	0	0	0
Loans receivable, Ending balance	2,587,000	3,021,000	2,587,000	3,021,000
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	2,587,000	3,021,000	2,587,000	3,021,000
Commercial real estate [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	1,587,000	1,625,000	1,346,000	1,204,000
Charge-offs	0	0	(54,000)	(71,000)
Recoveries	0	0	14,000	0
Provisions	200,000	(78,000)	481,000	414,000
Ending balance	1,787,000	1,547,000	1,787,000	1,547,000
Ending balance: related to loans individually evaluated for impairment	489,000	306,000	489,000	306,000
Ending balance: related to loans collectively evaluated for impairment	1,298,000	1,241,000	1,298,000	1,241,000
Loans receivable, Ending balance	79,770,000	70,685,000	79,770,000	70,685,000
Ending balance: individually evaluated for impairment	2,796,000	1,816,000	2,796,000	1,816,000
Ending balance: collectively evaluated for impairment	76,974,000	68,869,000	76,974,000	68,869,000
Commercial lines of credit [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	398,000	291,000	463,000	579,000
Charge-offs	0	(50,000)	0	(65,000)
Recoveries	0	1,000	50,000	1,000
Provisions	12,000	108,000	(103,000)	(165,000)
Ending balance	410,000	350,000	410,000	350,000
Ending balance: related to loans individually evaluated for impairment	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	410,000	350,000	410,000	350,000
Loans receivable, Ending balance	13,471,000	13,772,000	13,471,000	13,772,000
Ending balance: individually evaluated for impairment	374,000	74,000	374,000	74,000
Ending balance: collectively evaluated for impairment	13,097,000	13,698,000	13,097,000	13,698,000
Other commercial and industrial loans [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	698,000	831,000	649,000	501,000
Charge-offs	0	0	(89,000)	0
Recoveries	0	0	0	0
Provisions	112,000	(132,000)	250,000	198,000
Ending balance	810,000	699,000	810,000	699,000
Ending balance: related to loans individually evaluated for impairment	269,000	200,000	269,000	200,000
Ending balance: related to loans collectively evaluated for impairment	541,000	499,000	541,000	499,000
Loans receivable, Ending balance	27,509,000	22,631,000	27,509,000	22,631,000
Ending balance: individually evaluated for impairment	968,000	1,056,000	968,000	1,056,000
Ending balance: collectively evaluated for impairment	26,541,000	21,575,000	26,541,000	21,575,000
Municipal [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	2,000	2,000	2,000	3,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions	0	0	0	(1,000)
Ending balance	2,000	2,000	2,000	2,000
Ending balance: related to loans individually evaluated for impairment	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	2,000	2,000	2,000	2,000
Loans receivable, Ending balance	5,063,000	2,139,000	5,063,000	2,139,000
Ending balance: individually evaluated for impairment	0	0	0	0
Ending balance: collectively evaluated for impairment	5,063,000	2,139,000	5,063,000	2,139,000
Home equity and junior liens [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	501,000	460,000	501,000	424,000
Charge-offs	0	(19,000)	(8,000)	(43,000)
Recoveries	1,000	2,000	6,000	7,000
Provisions	(24,000)	73,000	(21,000)	128,000
Ending balance	478,000	516,000	478,000	516,000
Ending balance: related to loans individually evaluated for impairment	60,000	61,000	60,000	61,000
Ending balance: related to loans collectively evaluated for impairment	418,000	455,000	418,000	455,000
Loans receivable, Ending balance	22,580,000	24,842,000	22,580,000	24,842,000
Ending balance: individually evaluated for impairment	502,000	448,000	502,000	448,000
Ending balance: collectively evaluated for impairment	22,078,000	24,394,000	22,078,000	24,394,000
Other Consumer [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	131,000	116,000	162,000	89,000
Charge-offs	(30,000)	(37,000)	(114,000)	(88,000)
Recoveries	12,000	11,000	42,000	26,000
Provisions	65,000	60,000	88,000	123,000
Ending balance	178,000	150,000	178,000	150,000
Ending balance: related to loans individually evaluated for impairment	6,000	0	6,000	0
Ending balance: related to loans collectively evaluated for impairment	172,000	150,000	172,000	150,000
Loans receivable, Ending balance	3,627,000	3,743,000	3,627,000	3,743,000
Ending balance: individually evaluated for impairment	6,000	0	6,000	0
Ending balance: collectively evaluated for impairment	3,621,000	3,743,000	3,621,000	3,743,000
Unallocated [Member]
Allowance for credit losses [Roll Forward]
Beginning Balance	119,000	(6,000)	193,000	98,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions	(117,000)	91,000	(191,000)	(13,000)
Ending balance	2,000	85,000	2,000	85,000
Ending balance: related to loans individually evaluated for impairment	0	0	0	0
Ending balance: related to loans collectively evaluated for impairment	2,000	85,000	2,000	85,000
Loans receivable, Ending balance	0	0	0	0
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0