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Borrowed Funds - Schedule of Borrowed Funds (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 60,737 $ 121,322
FHLB line of credit 298,000 283,000
FHLB advances 766,409 1,037,960
Borrowed funds $ 1,125,146 $ 1,442,282