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Note Deposits (Summary of certificates of deposit by maturity) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deposits Abstract    
2018 $ 1,969,701  
2019 2,233,844  
2020 1,361,441  
2021 829,654  
2022 513,048  
2023 and thereafter 504,592  
Total certificates of deposit $ 7,412,280 $ 7,514,878