Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Cash Equivalents
Period in which federal funds are purchased and sold	1 day
Loans and Loan Fees
Estimated amortization term of residential mortgage loan net deferred fees or costs	5 years
Period of delinquency for classification of loans to non-accrual status	90 days
Delinquency period under non-accrual status	90 days
Performance period under modified terms to return to accrual status	6 months
Troubled Debt Restructurings
Performance period under modified terms to return to accrual status	6 months
Loan Impairment
Outstanding loans balances that are considered within homogeneous pools and are not individually evaluated for impairment, maximum	$ 100
Outstanding loans balances that are individually evaluated for impairment, if that loan is a part of larger impaired loan relationship or the loan is considered a TDR, maximum	$ 100