Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	$ 12,118,000	$ 10,529,000	$ 10,529,000
Provision for loan losses	294,000	1,466,000	2,133,000
Charge-offs	(467,000)	(1,068,000)	(2,086,000)
Recoveries	731,000	1,172,000	1,542,000
Balance, end of year	12,676,000	12,099,000	12,118,000
Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment	454,000		128,000
Collectively evaluated for impairment	11,859,000		11,515,000
Loans acquired with deteriorated credit quality	363,000		475,000
Total	12,676,000	12,099,000	12,118,000
Reserve for Unfunded Lending Commitments [Abstract]
Balance, beginning of year	201,000	200,000	200,000
Provision for loan losses	2,000	6,000	1,000
Charge-offs	0	0	0
Balance, end of year	203,000	206,000	201,000
Loans [Abstract]
Individually evaluated for impairment	3,397,000		3,047,000
Collectively evaluated for impairment	771,783,000		765,476,000
Loans acquired with deteriorated credit quality	18,865,000		20,182,000
Total Loans	794,045,000		788,705,000
Acquired loan portfolio	88,000,000
Commercial [Member]
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	1,450,000	1,236,000	1,236,000
Provision for loan losses	35,000		255,000
Charge-offs	(109,000)		(748,000)
Recoveries	241,000		707,000
Balance, end of year	1,617,000		1,450,000
Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment	7,000		107,000
Collectively evaluated for impairment	1,610,000		1,343,000
Loans acquired with deteriorated credit quality	0		0
Total	1,617,000		1,450,000
Loans [Abstract]
Individually evaluated for impairment	10,000		149,000
Collectively evaluated for impairment	130,431,000		125,707,000
Loans acquired with deteriorated credit quality	280,000		336,000
Total Loans	130,721,000		126,192,000
Commercial Real Estate [Member]
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	6,822,000	5,719,000	5,719,000
Provision for loan losses	166,000		1,200,000
Charge-offs	(23,000)		(572,000)
Recoveries	268,000		475,000
Balance, end of year	7,233,000		6,822,000
Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment	413,000		0
Collectively evaluated for impairment	6,506,000		6,376,000
Loans acquired with deteriorated credit quality	314,000		446,000
Total	7,233,000		6,822,000
Loans [Abstract]
Individually evaluated for impairment	3,007,000		2,607,000
Collectively evaluated for impairment	383,541,000		388,495,000
Loans acquired with deteriorated credit quality	11,804,000		13,143,000
Total Loans	398,352,000		404,245,000
Residential Real Estate [Member]
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	3,638,000	3,412,000	3,412,000
Provision for loan losses	88,000		641,000
Charge-offs	(230,000)		(694,000)
Recoveries	145,000		279,000
Balance, end of year	3,641,000		3,638,000
Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment	15,000		0
Collectively evaluated for impairment	3,577,000		3,609,000
Loans acquired with deteriorated credit quality	49,000		29,000
Total	3,641,000		3,638,000
Loans [Abstract]
Individually evaluated for impairment	361,000		270,000
Collectively evaluated for impairment	251,511,000		245,373,000
Loans acquired with deteriorated credit quality	6,781,000		6,703,000
Total Loans	258,653,000		252,346,000
Consumer [Member]
Allowance for Loan Losses [Roll Forward]
Balance, beginning of year	208,000	162,000	162,000
Provision for loan losses	5,000		37,000
Charge-offs	(105,000)		(72,000)
Recoveries	77,000		81,000
Balance, end of year	185,000		208,000
Allowance for Credit Loss, Additional Information [Abstract]
Individually evaluated for impairment	19,000		21,000
Collectively evaluated for impairment	166,000		187,000
Loans acquired with deteriorated credit quality	0		0
Total	185,000		208,000
Loans [Abstract]
Individually evaluated for impairment	19,000		21,000
Collectively evaluated for impairment	6,300,000		5,901,000
Loans acquired with deteriorated credit quality	0		0
Total Loans	$ 6,319,000		$ 5,922,000