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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, 2016
Dec. 31, 2015
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]    
2017 $ 649,756  
2018 310,998  
2019 4,600  
2020 1,105  
2021 314  
2022 and thereafter 2,173  
Total $ 968,946 $ 1,041,750
2017 1.11%  
2018 1.32%  
2019 3.72%  
2020 4.40%  
2021 5.25%  
2022 and thereafter 1.43%  
Total 1.19%