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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Real Estate [Abstract]      
Balance at the beginning of year, gross $ 7,764 $ 9,166 $ 9,166
Transfers in 1,840   5,578
Charge-offs (1,332)   (1,808)
Sales proceeds (2,927)   (5,438)
Gain on disposition 53 297 268
Depreciation      (2)
Balance at the end of period, gross 5,398   7,764
Less: allowance for losses (1,565)   (2,174)
Balance at the end of period, net $ 3,833   $ 5,590