Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Allowance for loan losses and the recorded investment in loans by portfolio segment
Total ending allowance balance	$ 18,880	$ 19,565	$ 18,270	$ 18,374	$ 19,412	$ 18,882
Total ending loans balance	9,427			8,798
Allowance for Loan Losses [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Allowance For Loan Losses, Individually evaluated for impairment	2,398		1,945
Allowance For Loan Losses, Collectively evaluated for impairment	16,482		16,325
Total ending allowance balance	18,880		18,270
Loans [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Loans: Individually evaluated for impairment	9,390		10,597
Loans: Collectively evaluated for impairment	1,111,733		1,183,637
Total ending loans balance	1,121,123		1,194,234
Commercial [Member] | Allowance for Loan Losses [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Allowance For Loan Losses, Individually evaluated for impairment	2,398		1,945
Allowance For Loan Losses, Collectively evaluated for impairment	5,128		5,826
Total ending allowance balance	7,526		7,771
Commercial [Member] | Loans [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Loans: Individually evaluated for impairment	9,390		10,597
Loans: Collectively evaluated for impairment	494,174		451,243
Total ending loans balance	503,564		461,840
Real estate [Member] | Allowance for Loan Losses [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Allowance For Loan Losses, Collectively evaluated for impairment	3,734		3,204
Total ending allowance balance			3,204
Total ending loans balance	3,734
Real estate [Member] | Loans [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Loans: Collectively evaluated for impairment	183,250		190,292
Total ending loans balance	183,250		190,292
Consumer [Member] | Allowance for Loan Losses [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Allowance For Loan Losses, Collectively evaluated for impairment	6,010		5,590
Total ending allowance balance			5,590
Total ending loans balance	6,010
Consumer [Member] | Loans [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Loans: Collectively evaluated for impairment	278,867		290,174
Total ending loans balance	278,867		290,174
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Allowance For Loan Losses, Collectively evaluated for impairment	1,610		1,705
Total ending allowance balance	1,610		1,705
Loans: Collectively evaluated for impairment	155,442
Total ending loans balance	155,442
Mortgage Warehousing [Member] | Loans [Member]
Allowance for loan losses and the recorded investment in loans by portfolio segment
Loans: Collectively evaluated for impairment			251,928
Total ending loans balance			$ 251,928