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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year 0.27% 0.27% 0.16%
Weighted-average interest rate during the year 0.20% 0.21% 2.28%
Average balance of FHLB advances $ 38,110 $ 69,781 $ 6,573
Maximum amount outstanding at any month-end $ 180,000 $ 150,000 $ 127,546