Summary of Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012 item
Allowance for loan and lease losses
Number of ALLL components	2
Commercial and Industrial loans
Allowance for loan and lease losses
Term of lines of credit	1 year
Commercial and Industrial loans | Minimum
Allowance for loan and lease losses
Term of loan	1 year
Commercial and Industrial loans | Maximum
Allowance for loan and lease losses
Term of loan	7 years
Construction, land acquisition and development | Underdeveloped real estate | Maximum
Allowance for loan and lease losses
Loan-to-value ratio	0.65
Construction, land acquisition and development | Developed real estate
Allowance for loan and lease losses
Loan-to-value ratio	0.80
Commercial Real Estate Loans
Allowance for loan and lease losses
Interest rate adjustment period one	3 years
Interest rate adjustment period two	7 years
Commercial Real Estate Loans | Minimum
Allowance for loan and lease losses
Debt service coverage ratio	1.2
Commercial Real Estate Loans | Maximum
Allowance for loan and lease losses
Loan-to-value ratio	0.80
Term of loan	20 years
Residential Real Estate Loans
Allowance for loan and lease losses
Loan-to-value ratio	0.80
Threshold minimum percentage of loan to value ratio for purchase of Private Mortgage Insurance (PMI)	80.00%
Base year treasury rate for non adjustment of interest rate on variable rate loans	1 year
Consumer Loans | Maximum
Allowance for loan and lease losses
Loan-to-value ratio	0.90
Term of loan	15 years