Description of Business and Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item
Description of Business and Summary of Significant Accounting Policies
Percentage of capital stock of the Bank held	100.00%
Number of depository branches	10
Cash and Cash Equivalents
Cash reserves required by the Board of Governors of the Federal Reserve for depository institutions (in dollars)	$ 17,500,000
Loans held for sale, net	$ 3,681,000
Buildings
Premises, furniture and equipment
Estimated useful life	40 years
Furniture, fixtures and equipment
Premises, furniture and equipment
Estimated useful life	7 years
Computer and telecommunication
Premises, furniture and equipment
Estimated useful life	3 years