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Deposits - Schedule of Deposits by Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]      
Non-interest-bearing deposits $ 6,542,490 $ 6,209,925  
Negotiable order of withdrawal (NOW) 4,514,113 4,348,939  
Money market deposits accounts (MMDA) 8,237,291 7,674,291  
Savings deposits 828,914 846,074  
Time deposits 3,640,623 2,387,488  
Total deposits $ 23,763,431 $ 21,466,717 $ 17,408,283