Non-performing Loans and Impaired Loans (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Loans by credit grades
Total	$ 1,116,242	$ 1,188,466
Commercial [Member]
Loans by credit grades
Total	501,464	459,558
Commercial [Member] | Owner occupied real estate [Member]
Loans by credit grades
Total	159,379	162,694
Commercial [Member] | Non owner occupied real estate [Member]
Loans by credit grades
Total	233,203	201,763
Commercial [Member] | Residential development [Member]
Loans by credit grades
Total	245	1,056
Commercial [Member] | Development & Spec Land Loans [Member]
Loans by credit grades
Total	12,988	6,963
Commercial [Member] | Commercial and industrial [Member]
Loans by credit grades
Total	95,649	87,082
Real estate [Member]
Loans by credit grades
Total	337,127	440,579
Real estate [Member] | Residential mortgage [Member]
Loans by credit grades
Total	174,032	181,450
Real estate [Member] | Residential construction [Member]
Loans by credit grades
Total	8,133	7,681
Real estate [Member] | Mortgage warehouse [Member]
Loans by credit grades
Total	154,962	251,448
Consumer [Member]
Loans by credit grades
Total	277,651	288,329
Consumer [Member] | Direct Installment [Member]
Loans by credit grades
Total	28,099	27,831
Consumer [Member] | Direct Installment Purchased [Member]
Loans by credit grades
Total	358	429
Consumer [Member] | Indirect Installment [Member]
Loans by credit grades
Total	128,647	133,481
Consumer [Member] | Home Equity [Member]
Loans by credit grades
Total	120,547	126,588
Pass [Member]
Loans by credit grades
Total	1,049,473	1,107,191
Percentage of total loans	94.02%	93.16%
Pass [Member] | Commercial [Member]
Loans by credit grades
Total	450,878	391,369
Pass [Member] | Commercial [Member] | Owner occupied real estate [Member]
Loans by credit grades
Total	147,937	137,664
Pass [Member] | Commercial [Member] | Non owner occupied real estate [Member]
Loans by credit grades
Total	209,033	171,319
Pass [Member] | Commercial [Member] | Residential development [Member]
Loans by credit grades
Total	245	405
Pass [Member] | Commercial [Member] | Development & Spec Land Loans [Member]
Loans by credit grades
Total	9,618	3,171
Pass [Member] | Commercial [Member] | Commercial and industrial [Member]
Loans by credit grades
Total	84,045	78,810
Pass [Member] | Real estate [Member]
Loans by credit grades
Total	327,761	431,424
Pass [Member] | Real estate [Member] | Residential mortgage [Member]
Loans by credit grades
Total	164,953	172,586
Pass [Member] | Real estate [Member] | Residential construction [Member]
Loans by credit grades
Total	7,846	7,390
Pass [Member] | Real estate [Member] | Mortgage warehouse [Member]
Loans by credit grades
Total	154,962	251,448
Pass [Member] | Consumer [Member]
Loans by credit grades
Total	270,834	284,398
Pass [Member] | Consumer [Member] | Direct Installment [Member]
Loans by credit grades
Total	27,658	27,667
Pass [Member] | Consumer [Member] | Direct Installment Purchased [Member]
Loans by credit grades
Total	358	429
Pass [Member] | Consumer [Member] | Indirect Installment [Member]
Loans by credit grades
Total	127,930	132,589
Pass [Member] | Consumer [Member] | Home Equity [Member]
Loans by credit grades
Total	114,888	123,713
Special Mention [Member]
Loans by credit grades
Total	14,996	29,161
Percentage of total loans	1.34%	2.45%
Special Mention [Member] | Commercial [Member]
Loans by credit grades
Total	14,996	29,161
Special Mention [Member] | Commercial [Member] | Owner occupied real estate [Member]
Loans by credit grades
Total	3,247	6,407
Special Mention [Member] | Commercial [Member] | Non owner occupied real estate [Member]
Loans by credit grades
Total	5,490	19,440
Special Mention [Member] | Commercial [Member] | Development & Spec Land Loans [Member]
Loans by credit grades
Total	96	178
Special Mention [Member] | Commercial [Member] | Commercial and industrial [Member]
Loans by credit grades
Total	6,163	3,136
Special Mention [Member] | Real estate [Member]
Loans by credit grades
Total
Special Mention [Member] | Real estate [Member] | Residential mortgage [Member]
Loans by credit grades
Total
Special Mention [Member] | Real estate [Member] | Residential construction [Member]
Loans by credit grades
Total
Special Mention [Member] | Real estate [Member] | Mortgage warehouse [Member]
Loans by credit grades
Total
Special Mention [Member] | Consumer [Member]
Loans by credit grades
Total
Special Mention [Member] | Consumer [Member] | Direct Installment [Member]
Loans by credit grades
Total
Special Mention [Member] | Consumer [Member] | Direct Installment Purchased [Member]
Loans by credit grades
Total
Special Mention [Member] | Consumer [Member] | Indirect Installment [Member]
Loans by credit grades
Total
Special Mention [Member] | Consumer [Member] | Home Equity [Member]
Loans by credit grades
Total
Substandard [Member]
Loans by credit grades
Total	51,773	50,233
Percentage of total loans	4.64%	4.23%
Substandard [Member] | Commercial [Member]
Loans by credit grades
Total	35,590	37,147
Substandard [Member] | Commercial [Member] | Owner occupied real estate [Member]
Loans by credit grades
Total	8,195	17,029
Substandard [Member] | Commercial [Member] | Non owner occupied real estate [Member]
Loans by credit grades
Total	18,680	10,717
Substandard [Member] | Commercial [Member] | Residential development [Member]
Loans by credit grades
Total		651
Substandard [Member] | Commercial [Member] | Development & Spec Land Loans [Member]
Loans by credit grades
Total	3,274	3,614
Substandard [Member] | Commercial [Member] | Commercial and industrial [Member]
Loans by credit grades
Total	5,441	5,136
Substandard [Member] | Real estate [Member]
Loans by credit grades
Total	9,366	9,155
Substandard [Member] | Real estate [Member] | Residential mortgage [Member]
Loans by credit grades
Total	9,079	8,864
Substandard [Member] | Real estate [Member] | Residential construction [Member]
Loans by credit grades
Total	287	291
Substandard [Member] | Real estate [Member] | Mortgage warehouse [Member]
Loans by credit grades
Total
Substandard [Member] | Consumer [Member]
Loans by credit grades
Total	6,817	3,931
Substandard [Member] | Consumer [Member] | Direct Installment [Member]
Loans by credit grades
Total	441	164
Substandard [Member] | Consumer [Member] | Direct Installment Purchased [Member]
Loans by credit grades
Total
Substandard [Member] | Consumer [Member] | Indirect Installment [Member]
Loans by credit grades
Total	717	892
Substandard [Member] | Consumer [Member] | Home Equity [Member]
Loans by credit grades
Total	5,659	2,875
Doubtful [Member]
Loans by credit grades
Total		1,881
Percentage of total loans	0.00%	0.16%
Doubtful [Member] | Commercial [Member]
Loans by credit grades
Total		1,881
Doubtful [Member] | Commercial [Member] | Owner occupied real estate [Member]
Loans by credit grades
Total		1,594
Doubtful [Member] | Commercial [Member] | Non owner occupied real estate [Member]
Loans by credit grades
Total		287
Doubtful [Member] | Commercial [Member] | Residential development [Member]
Loans by credit grades
Total
Doubtful [Member] | Commercial [Member] | Development & Spec Land Loans [Member]
Loans by credit grades
Total
Doubtful [Member] | Commercial [Member] | Commercial and industrial [Member]
Loans by credit grades
Total
Doubtful [Member] | Real estate [Member]
Loans by credit grades
Total
Doubtful [Member] | Real estate [Member] | Residential mortgage [Member]
Loans by credit grades
Total
Doubtful [Member] | Real estate [Member] | Residential construction [Member]
Loans by credit grades
Total
Doubtful [Member] | Real estate [Member] | Mortgage warehouse [Member]
Loans by credit grades
Total
Doubtful [Member] | Consumer [Member]
Loans by credit grades
Total
Doubtful [Member] | Consumer [Member] | Direct Installment [Member]
Loans by credit grades
Total
Doubtful [Member] | Consumer [Member] | Direct Installment Purchased [Member]
Loans by credit grades
Total
Doubtful [Member] | Consumer [Member] | Indirect Installment [Member]
Loans by credit grades
Total
Doubtful [Member] | Consumer [Member] | Home Equity [Member]
Loans by credit grades
Total