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Borrowed Funds - Schedule of Borrowed Funds (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 261,350 $ 246,571
FHLB line of credit 96,000 73,000
FHLB advances 1,350,282 1,190,280
Borrowed funds $ 1,707,632 $ 1,509,851