Non-Performing Loans and Impaired Loans (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans by credit grades
Total	$ 1,155,965	$ 984,167
Commercial [Member]
Loans by credit grades
Total	447,332	352,249
Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	168,015	131,893
Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	187,953	142,269
Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	1,130	3,574
Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	6,645	8,739
Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	83,589	65,774
Real estate [Member]
Loans by credit grades
Total	420,695	365,373
Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	164,720	150,893
Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	11,742	6,181
Real estate [Member] \| Mortgage warehouse [Member]
Loans by credit grades
Total	244,233	208,299
Consumer [Member]
Loans by credit grades
Total	287,938	266,545
Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	30,247	24,252
Consumer [Member] \| Direct Installment Purchased [Member]
Loans by credit grades
Total	518	981
Consumer [Member] \| Indirect Installment [Member]
Loans by credit grades
Total	128,502	127,751
Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	128,671	113,561
Pass [Member]
Loans by credit grades
Total	1,064,776	906,753
Pass [Member] \| Commercial [Member]
Loans by credit grades
Total	368,602	287,020
Pass [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	137,121	107,155
Pass [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	153,131	118,446
Pass [Member] \| Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	434	1,677
Pass [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	3,637	3,778
Pass [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	74,279	55,964
Pass [Member] \| Real estate [Member]
Loans by credit grades
Total	411,862	356,877
Pass [Member] \| Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	156,179	142,834
Pass [Member] \| Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	11,450	5,744
Pass [Member] \| Real estate [Member] \| Mortgage warehouse [Member]
Loans by credit grades
Total	244,233	208,299
Pass [Member] \| Consumer [Member]
Loans by credit grades
Total	284,312	262,856
Pass [Member] \| Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	30,149	23,995
Pass [Member] \| Consumer [Member] \| Direct Installment Purchased [Member]
Loans by credit grades
Total	518	977
Pass [Member] \| Consumer [Member] \| Indirect Installment [Member]
Loans by credit grades
Total	127,537	126,796
Pass [Member] \| Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	126,108	111,088
Special Mention [Member]
Loans by credit grades
Total	34,110	19,925
Special Mention [Member] \| Commercial [Member]
Loans by credit grades
Total	34,110	19,925
Special Mention [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	8,826	4,101
Special Mention [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	20,694	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	251	860
Special Mention [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	4,339	3,012
Substandard [Member]
Loans by credit grades
Total	51,137	57,489
Substandard [Member] \| Commercial [Member]
Loans by credit grades
Total	38,678	45,304
Substandard [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	17,632	20,637
Substandard [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	13,008	12,400
Substandard [Member] \| Commercial [Member] \| Residential development [Member]
Loans by credit grades
Total	696	1,368
Substandard [Member] \| Commercial [Member] \| Development & Spec Land Loans [Member]
Loans by credit grades
Total	2,627	4,101
Substandard [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	4,715	6,798
Substandard [Member] \| Real estate [Member]
Loans by credit grades
Total	8,833	8,496
Substandard [Member] \| Real estate [Member] \| Residential mortgage [Member]
Loans by credit grades
Total	8,541	8,059
Substandard [Member] \| Real estate [Member] \| Residential construction [Member]
Loans by credit grades
Total	292	437
Substandard [Member] \| Consumer [Member]
Loans by credit grades
Total	3,626	3,689
Substandard [Member] \| Consumer [Member] \| Direct Installment [Member]
Loans by credit grades
Total	98	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	965	955
Substandard [Member] \| Consumer [Member] \| Home Equity [Member]
Loans by credit grades
Total	2,563	2,473
Doubtful [Member]
Loans by credit grades
Total	5,942
Doubtful [Member] \| Commercial [Member]
Loans by credit grades
Total	5,942
Doubtful [Member] \| Commercial [Member] \| Owner occupied real estate [Member]
Loans by credit grades
Total	4,436
Doubtful [Member] \| Commercial [Member] \| Non owner occupied real estate [Member]
Loans by credit grades
Total	1,120
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	130
Doubtful [Member] \| Commercial [Member] \| Commercial and industrial [Member]
Loans by credit grades
Total	256
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