Non-Performing Loans and Impaired Loans (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Payment status by class of loan
30 - 59 Days Past Due	$ 5,065	$ 2,629
60 - 89 Days Past Due	3,286	653
Greater than 90 Days Past Due	109	37
Total Past Due	8,460	3,319
Loans Not Past Due	1,147,505	980,848
Total	1,155,965	984,167
Commercial [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,441	351
60 - 89 Days Past Due	2,606	190
Greater than 90 Days Past Due	9
Total Past Due	4,056	541
Loans Not Past Due	443,276	351,708
Total	447,332	352,249
Commercial [Member] | Owner occupied real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,008	89
60 - 89 Days Past Due	110	168
Total Past Due	1,118	257
Loans Not Past Due	166,897	131,636
Total	168,015	131,893
Commercial [Member] | Non owner occupied real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due		228
60 - 89 Days Past Due	123
Total Past Due	123	228
Loans Not Past Due	187,830	142,041
Total	187,953	142,269
Commercial [Member] | Residential development [Member]
Payment status by class of loan
Loans Not Past Due	1,130	3,574
Total	1,130	3,574
Commercial [Member] | Development & Spec Land Loans [Member]
Payment status by class of loan
Loans Not Past Due	6,645	8,739
Total	6,645	8,739
Commercial [Member] | Commercial and industrial [Member]
Payment status by class of loan
30 - 59 Days Past Due	433	34
60 - 89 Days Past Due	2,373	22
Greater than 90 Days Past Due	9
Total Past Due	2,815	56
Loans Not Past Due	80,774	65,718
Total	83,589	65,774
Real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,300	411
60 - 89 Days Past Due	197
Greater than 90 Days Past Due	57
Total Past Due	1,554	411
Loans Not Past Due	419,141	364,962
Total	420,695	365,373
Real estate [Member] | Residential mortgage [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,300	411
60 - 89 Days Past Due	197
Greater than 90 Days Past Due	57
Total Past Due	1,554	411
Loans Not Past Due	163,166	150,482
Total	164,720	150,893
Real estate [Member] | Residential construction [Member]
Payment status by class of loan
Loans Not Past Due	11,742	6,181
Total	11,742	6,181
Real estate [Member] | Mortgage warehouse [Member]
Payment status by class of loan
Loans Not Past Due	244,233	208,299
Total	244,233	208,299
Consumer [Member]
Payment status by class of loan
30 - 59 Days Past Due	2,324	1,867
60 - 89 Days Past Due	483	463
Greater than 90 Days Past Due	43	37
Total Past Due	2,850	2,367
Loans Not Past Due	285,088	264,178
Total	287,938	266,545
Consumer [Member] | Direct Installment [Member]
Payment status by class of loan
30 - 59 Days Past Due	162	164
60 - 89 Days Past Due	243	22
Greater than 90 Days Past Due	1	1
Total Past Due	406	187
Loans Not Past Due	29,841	24,065
Total	30,247	24,252
Consumer [Member] | Direct Installment Purchased [Member]
Payment status by class of loan
30 - 59 Days Past Due		7
60 - 89 Days Past Due		14
Greater than 90 Days Past Due		4
Total Past Due		25
Loans Not Past Due	518	956
Total	518	981
Consumer [Member] | Indirect Installment [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,124	1,333
60 - 89 Days Past Due	101	335
Greater than 90 Days Past Due	42	29
Total Past Due	1,267	1,697
Loans Not Past Due	127,235	126,054
Total	128,502	127,751
Consumer [Member] | Home Equity [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,038	363
60 - 89 Days Past Due	139	92
Greater than 90 Days Past Due		3
Total Past Due	1,177	458
Loans Not Past Due	127,494	113,103
Total	$ 128,671	$ 113,561