Annual report pursuant to Section 13 and 15(d)

FHLB Advances and Other Borrowings - Additional Information (Detail)

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FHLB Advances and Other Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Pledged investment securities available for sale, carrying values $ 17,100,000    
Pledged investment loans receivable, carrying values 363,800,000    
Total borrowing capacity available from the collateral 275,100,000    
Available borrowing capacity 272,100,000    
Available for use through the Fed Discount Window 111,400,000    
Pledged loans with a carrying value 160,200,000    
Advances from the FHLB 2,935,000 3,303,000  
Decrease in the advance 368,000    
Percentage of decrease in advance from FHLB 11.10%    
Interest expense on FHLB advances and other borrowings $ 165,000 $ 662,000 $ 1,400,000
Weighted-average interest rates 5.27% 1.00% 0.88%