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Real Estate and Other Assets Acquired in Settlement of Loans (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of activity in valuation allowance for other real estate owned in settlement of loans      
Balance, beginning of year $ 6,977 $ 6,158 $ 0
Provision for other real estate owned 713 1,252 6,158
Charge-offs (1,553) (433) 0
Balance, end of year $ 6,137 $ 6,977 $ 6,158