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Note Deposits (Summary of certificates of deposit by maturity) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits Abstract    
2019 $ 4,191,832  
2020 1,460,072  
2021 834,767  
2022 492,480  
2023 576,596  
2024 and thereafter 61,017  
Total certificates of deposit $ 7,616,764 $ 7,514,878