Non-performing Assets and Impaired Loans (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loans by credit grades
Total	$ 1,188,466	$ 984,167
Commercial [Member]
Loans by credit grades
Total	459,558	352,249
Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	162,694	131,893
Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	201,763	142,269
Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	1,056	3,574
Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	6,963	8,739
Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	87,082	65,774
Real estate [Member]
Loans by credit grades
Total	440,579	365,373
Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	181,450	150,893
Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	7,681	6,181
Real estate [Member] \| Mortgage warehouse [Member]
Loans by credit grades
Total	251,448	208,299
Consumer [Member]
Loans by credit grades
Total	288,329	266,545
Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	27,831	24,252
Consumer [Member] \| Direct Installment Purchased [Member]
Loans by credit grades
Total	429	981
Consumer [Member] \| Indirect Installment [Member]
Loans by credit grades
Total	133,481	127,751
Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	126,588	113,561
Pass [Member]
Loans by credit grades
Total	1,107,191	906,753
Percentage of total loans	93.16%	92.13%
Pass [Member] \| Commercial [Member]
Loans by credit grades
Total	391,369	287,020
Pass [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	137,664	107,155
Pass [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	171,319	118,446
Pass [Member] \| Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	405	1,677
Pass [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	3,171	3,778
Pass [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	78,810	55,964
Pass [Member] \| Real estate [Member]
Loans by credit grades
Total	431,424	356,877
Pass [Member] \| Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	172,586	142,834
Pass [Member] \| Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	7,390	5,744
Pass [Member] \| Real estate [Member] \| Mortgage warehouse [Member]
Loans by credit grades
Total	251,448	208,299
Pass [Member] \| Consumer [Member]
Loans by credit grades
Total	284,398	262,856
Pass [Member] \| Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	27,667	23,995
Pass [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Loans by credit grades
Total	429	977
Pass [Member] \| Consumer [Member] \| Indirect Installment [Member]
Loans by credit grades
Total	132,589	126,796
Pass [Member] \| Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	123,713	111,088
Special Mention [Member]
Loans by credit grades
Total	29,161	19,925
Percentage of total loans	2.45%	2.02%
Special Mention [Member] \| Commercial [Member]
Loans by credit grades
Total	29,161	19,925
Special Mention [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	6,407	4,101
Special Mention [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	19,440	11,423
Special Mention [Member] \| Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total		529
Special Mention [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	178	860
Special Mention [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	3,136	3,012
Substandard [Member]
Loans by credit grades
Total	50,233	57,489
Percentage of total loans	4.23%	5.84%
Substandard [Member] \| Commercial [Member]
Loans by credit grades
Total	37,147	45,304
Substandard [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	17,029	20,637
Substandard [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	10,717	12,400
Substandard [Member] \| Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	651	1,368
Substandard [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	3,614	4,101
Substandard [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	5,136	6,798
Substandard [Member] \| Real estate [Member]
Loans by credit grades
Total	9,155	8,496
Substandard [Member] \| Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	8,864	8,059
Substandard [Member] \| Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	291	437
Substandard [Member] \| Consumer [Member]
Loans by credit grades
Total	3,931	3,689
Substandard [Member] \| Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	164	257
Substandard [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Loans by credit grades
Total		4
Substandard [Member] \| Consumer [Member] \| Indirect Installment [Member]
Loans by credit grades
Total	892	955
Substandard [Member] \| Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	2,875	2,473
Doubtful [Member]
Loans by credit grades
Total	1,881
Percentage of total loans	0.16%	0.00%
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