4. Loans and Allowance for Loan Losses (Details 9) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 43,718	$ 34,273
Unpaid contractual principal balance	47,995	36,153
Allocated allowance	6,842	5,721
Average recorded investment	39,658	33,581
ConstructionAndLandDevelopmentMember | LoansWithoutSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	3,129	4,351
Unpaid contractual principal balance	3,191	4,351
Allocated allowance	0	0
Average recorded investment	3,402	3,772
ConstructionAndLandDevelopmentMember | LoansWithSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	10,448	10,867
Unpaid contractual principal balance	12,490	10,867
Allocated allowance	3,857	4,071
Average recorded investment	10,365	10,235
CommercialRealEstateMember | LoansWithoutSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	7,383	6,827
Unpaid contractual principal balance	7,453	7,105
Allocated allowance	0	0
Average recorded investment	7,782	4,484
CommercialRealEstateMember | LoansWithSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	16,709	6,903
Unpaid contractual principal balance	17,257	6,927
Allocated allowance	2,561	1,088
Average recorded investment	11,874	7,494
ConsumerRealEstateMember | LoansWithoutSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	3,387	2,412
Unpaid contractual principal balance	4,942	3,990
Allocated allowance	0	0
Average recorded investment	3,290	2,146
ConsumerRealEstateMember | LoansWithSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment	2,662	2,913
Unpaid contractual principal balance	2,662	2,913
Allocated allowance	424	562
Average recorded investment	2,945	2,295
CommercialAndIndustrialLoansMember | LoansWithoutSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment		0
Unpaid contractual principal balance		0
Allocated allowance		0
Average recorded investment		517
CommercialAndIndustrialLoansMember | LoansWithSpecificValuationAllowanceMember
Financing Receivable, Impaired [Line Items]
Recorded investment		0
Unpaid contractual principal balance		0
Allocated allowance		0
Average recorded investment		$ 2,638