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FHLB and Other Short-Term Borrowings - Schedule of Aggregate Annual Maturities and Weighted-Average Interest Rates of FHLB Borrowing (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank Advances Maturities Summary [Abstract]    
2020 $ 1,055,924  
2021 340,205  
2022 17,940  
2025 and thereafter 1,546  
Total $ 1,415,615 $ 1,054,174
2020 2.17%  
2021 2.54%  
2022 2.91%  
2025 and thereafter 1.40%  
Total 2.27%