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Other Real Estate Owned (OREO) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Summary of Changes in the balance for OREO      
Balance at the beginning of year, gross $ 7,764 $ 9,166 $ 9,166
Transfers in 742   5,578
Charge-offs (191)   (1,808)
Sales proceeds (1,038)   (5,438)
Gain on disposition 116 90 268
Depreciation     (2)
Balance at the end of period, gross 7,393   7,764
Less: allowance for losses (2,220)   (2,174)
Balance at the end of period, net $ 5,173   $ 5,590