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Other Real Estate Owned (OREO) - Summary of Changes in the Balance for OREO (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Real Estate [Abstract]      
Balance at the beginning of year, gross $ 4,695 $ 7,764 $ 7,764
Transfers in   (63) 2,036
Charge-offs (2)   (1,564)
Sales proceeds (16)   (3,618)
Gain on disposition 1   80
Depreciation     (3)
Balance at the end of period, gross 4,678   4,695
Less: valuation allowance (1,686)   (1,665)
Balance at the end of period, net $ 2,992   $ 3,030