Loans (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Loans
Total loans	$ 367,134,000		$ 328,199,000
Allowance for loan losses	(1,935,000)	(1,891,000)	(1,656,000)	(1,608,000)	(1,597,000)	(1,569,000)
Net deferred loan costs	2,468,000		2,033,000
Loans, net	367,667,000		328,576,000
Historical loss period used to capture relevant loss data for each loan segment	10 years
Period of charge-off trends to be considered for adjustment to historical loss factor	3 years
Residential 1-4 family
Loans
Allowance for loan losses	(673,000)	(592,000)	(462,000)	(459,000)	(416,000)	(393,000)
Home equity and lines of credit
Loans
Allowance for loan losses	(592,000)	(607,000)	(605,000)	(581,000)	(649,000)	(674,000)
Commercial real estate
Loans
Allowance for loan losses	(361,000)	(353,000)	(321,000)	(285,000)	(283,000)	(261,000)
Commercial business
Loans
Allowance for loan losses	(27,000)	(30,000)	(29,000)	(27,000)	(28,000)	(25,000)
Commercial construction
Loans
Allowance for loan losses	(33,000)	(45,000)	(24,000)	(23,000)	(20,000)	(11,000)
SBA
Loans
Allowance for loan losses	(236,000)	(250,000)	(197,000)	(215,000)	(185,000)	(185,000)
Consumer
Loans
Total loans	1,450,000		1,672,000
Residential real estate mortgage loans
Loans
Total loans	204,362,000		181,514,000
Residential real estate mortgage loans | Residential 1-4 family
Loans
Total loans	122,604,000		98,180,000
Residential real estate mortgage loans | Home equity and lines of credit
Loans
Total loans	81,758,000		83,334,000
Commercial loans
Loans
Total loans	161,322,000		145,013,000
Commercial loans | Commercial real estate
Loans
Total loans	100,275,000		91,609,000
Commercial loans | Commercial business
Loans
Total loans	7,539,000		8,301,000
Commercial loans | Commercial construction
Loans
Total loans	9,124,000		7,099,000
Loans provided as a percentage of projected costs	50.00%
Commercial loans | SBA
Loans
Total loans	44,384,000		38,004,000
Commercial loans | SBA | Maximum
Loans
Percentage of principal and accrued interest that may qualify for guarantees	85.00%
Guaranteed portions	$ 3,750,000