Allowance for Loan Losses Policy Information (Details)	Dec. 31, 2012
Receivables [Abstract]
Minimum Typical Advance Rate of the Collateral Value Securing Commercial and Industrial Loans	50.00%
Maximum Typical Loan Advance Rate of the Collateral Value Securing Commercial and Industrial Loans	80.00%
Miminum Amount of Space that a Borrower Occupies for an Owner-Occupied Loan	51.00%
Maximum Loan to Value for One-to-Four Family Residential Mortgages and Home Equity Lines of Credit that are Secured by a First or Second Mortgage on Owner and Non-owner Occupied Residences	80.00%
Loan To Value Threshold For Private Mortgage Insurance Requirement	80.00%