Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Ending Balance Attributable to Loans
Individually evaluated for impairment	$ 1,243		$ 3,158
Collectively evaluated for impairment	15,487		15,862
Acquired with deteriorated credit quality	777		1,048
Ending Balance	17,507	18,255	20,068	22,004	22,133	21,958
Loans
Individually evaluated for impairment	17,553		18,862
Collectively evaluated for impairment	1,794,043		1,771,562
Acquired with deteriorated credit quality	7,689		10,398
Total	1,819,285		1,800,822
Commercial
Ending Balance Attributable to Loans
Individually evaluated for impairment	1,243		3,158
Collectively evaluated for impairment	8,197		8,421
Acquired with deteriorated credit quality	740		871
Ending Balance	10,180	10,850	12,450	14,018	14,531	10,987
Loans
Individually evaluated for impairment	17,495		18,825
Collectively evaluated for impairment	1,047,045		1,020,771
Acquired with deteriorated credit quality	5,850		8,001
Total	1,070,390		1,047,597
Residential
Ending Balance Attributable to Loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,290		1,408
Acquired with deteriorated credit quality	37		177
Ending Balance	1,327	1,374	1,585	1,440	1,592	5,426
Loans
Individually evaluated for impairment	58		37
Collectively evaluated for impairment	476,522		481,439
Acquired with deteriorated credit quality	1,839		2,397
Total	478,419		483,873
Consumer
Ending Balance Attributable to Loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,916		3,650
Acquired with deteriorated credit quality	0		0
Ending Balance	3,916	3,769	3,650	3,625	3,637	3,879
Loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	270,476		269,352
Acquired with deteriorated credit quality	0		0
Total	270,476		269,352
Unallocated
Ending Balance Attributable to Loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	2,084		2,383
Acquired with deteriorated credit quality	0		0
Ending Balance	$ 2,084	$ 2,262	$ 2,383	$ 2,921	$ 2,373	$ 1,666