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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Federal Home Loan Bank advances $ 1,167,000 $ 475,000
Securities sold under agreements to repurchase 315,882 516,297
Total short-term borrowings 1,482,882 991,297
Short-term Debt, Other Disclosures    
Outstanding at December 31 1,482,882 991,297
Maximum month-end outstanding balance 1,482,882 2,197,105
Average daily outstanding balance $ 1,052,088 $ 905,755
Average rate during the year 1.40% 0.83%
Average rate at year end 2.12% 0.82%