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Borrowed Funds - Schedule of Borrowed Funds (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 143,179 $ 156,665
FHLB line of credit 472,000 161,000
FHLB advances 1,127,335 1,295,080
Borrowed funds $ 1,742,514 $ 1,612,745