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Other Real Estate Owned (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Changes in the balance for OREO      
Balance at the beginning of year, gross $ 9,166 $ 7,302 $ 7,302
Transfers from loans 4,287   8,117
Charge-offs (1,539)   (2,022)
Sales proceeds (5,041)   (3,321)
Gain (loss) on disposition 297 28 (910)
Balance at the end of period, gross 7,170   9,166
Less: allowance for losses (1,847)   (2,792)
Balance at the end of period, net $ 5,323   $ 6,374