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Supplemental Disclosures of Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash payments for:    
Interest $ 2,587 $ 3,995
Income taxes 1,531 1,601
Noncash investing activities:    
Transfers from loans to real estate acquired through foreclosure 841 1,256
Proceeds from sales of foreclosed real estate financed through loans $ 181 $ 267