Annual report pursuant to Section 13 and 15(d)

FHLB Advances and Other Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail)

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FHLB Advances and Other Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Weighted-Average Interest Rate at End of Year 5.27% 5.27% 0.87%
Weighted-Average Interest Rate During the Year 5.27% 1.00% 0.88%
Average Balance of FHLB Advances $ 3,354 $ 66,191 $ 158,531
Maximum Amount Outstanding at Any Month-End $ 3,273 $ 153,622 $ 153,951