Non-performing Assets and Impaired Loans (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Payment status by class of loan
30 - 59 Days Past Due	$ 5,998	$ 2,629
60 - 89 Days Past Due	744	653
Greater than 90 Days Past Due	54	37
Total Past Due	6,796	3,319
Loans Not Past Due	1,181,670	980,848
Total	1,188,466	984,167
30 - 59 Days Past Due, Percentage of Total Loans	0.50%	0.27%
60 - 89 Days Past Due, Percentage of Total Loans	0.06%	0.07%
Greater than 90 Days Past Due, Percentage of Total Loans	0.00%	0.00%
Total Past Due, Percentage of Total Loans	0.57%	0.34%
Loans Not Past Due, Percentage of Total Loans	99.43%	99.66%
Commercial [Member]
Payment status by class of loan
30 - 59 Days Past Due	3,414	351
60 - 89 Days Past Due	182	190
Total Past Due	3,596	541
Loans Not Past Due	455,962	351,708
Total	459,558	352,249
Commercial [Member] | Owner occupied real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due	2,207	89
60 - 89 Days Past Due	19	168
Total Past Due	2,226	257
Loans Not Past Due	160,468	131,636
Total	162,694	131,893
Commercial [Member] | Non owner occupied real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due	669	228
60 - 89 Days Past Due	147
Total Past Due	816	228
Loans Not Past Due	200,947	142,041
Total	201,763	142,269
Commercial [Member] | Residential development [Member]
Payment status by class of loan
Loans Not Past Due	1,056	3,574
Total	1,056	3,574
Commercial [Member] | Development & Spec Land Loans [Member]
Payment status by class of loan
Loans Not Past Due	6,963	8,739
Total	6,963	8,739
Commercial [Member] | Commercial and industrial [Member]
Payment status by class of loan
30 - 59 Days Past Due	538	34
60 - 89 Days Past Due	16	22
Total Past Due	554	56
Loans Not Past Due	86,528	65,718
Total	87,082	65,774
Real estate [Member]
Payment status by class of loan
30 - 59 Days Past Due	167	411
Greater than 90 Days Past Due	2
Total Past Due	169	411
Loans Not Past Due	440,410	364,962
Total	440,579	365,373
Real estate [Member] | Residential mortgage [Member]
Payment status by class of loan
30 - 59 Days Past Due	167	411
Greater than 90 Days Past Due	2
Total Past Due	169	411
Loans Not Past Due	181,281	150,482
Total	181,450	150,893
Real estate [Member] | Residential construction [Member]
Payment status by class of loan
Loans Not Past Due	7,681	6,181
Total	7,681	6,181
Real estate [Member] | Mortgage warehouse [Member]
Payment status by class of loan
Loans Not Past Due	251,448	208,299
Total	251,448	208,299
Consumer [Member]
Payment status by class of loan
30 - 59 Days Past Due	2,417	1,867
60 - 89 Days Past Due	562	463
Greater than 90 Days Past Due	52	37
Total Past Due	3,031	2,367
Loans Not Past Due	285,298	264,178
Total	288,329	266,545
Consumer [Member] | Direct Installment [Member]
Payment status by class of loan
30 - 59 Days Past Due	240	164
60 - 89 Days Past Due	64	22
Greater than 90 Days Past Due	26	1
Total Past Due	330	187
Loans Not Past Due	27,501	24,065
Total	27,831	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	429	956
Total	429	981
Consumer [Member] | Indirect Installment [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,105	1,333
60 - 89 Days Past Due	177	335
Greater than 90 Days Past Due	26	29
Total Past Due	1,308	1,697
Loans Not Past Due	132,173	126,054
Total	133,481	127,751
Consumer [Member] | Home Equity [Member]
Payment status by class of loan
30 - 59 Days Past Due	1,072	363
60 - 89 Days Past Due	321	92
Greater than 90 Days Past Due		3
Total Past Due	1,393	458
Loans Not Past Due	125,195	113,103
Total	$ 126,588	$ 113,561