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Borrowed Funds - Schedule of Borrowed Funds (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 99,936 $ 60,737
FHLB line of credit 25,000 298,000
FHLB advances 1,051,036 766,409
Borrowed funds $ 1,175,972 $ 1,125,146