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Weighted Average Interest Rates for Each Type of Deposit (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amount    
Interest-bearing checking and money market accounts $ 10,230,144 $ 11,530,049
Savings accounts 4,780,007 4,643,260
Certificates of deposit 14,214,858 12,194,322
Non-interest-bearing accounts 2,432,123 2,396,799
Total deposits $ 31,657,132 $ 30,764,430
Percent of Total    
Interest-bearing checking and money market accounts 32.32% 37.48%
Savings accounts 15.10% 15.09%
Certificates of deposit 44.90% 39.64%
Non-interest-bearing accounts 7.68% 7.79%
Total deposits 100.00% 100.00%
Weighted Average Interest Rate    
Interest-bearing checking and money market accounts, weighted average interest rate 1.30% 1.74%
Savings accounts, weighted average interest rate 0.75% 0.68%
Certificates of deposit, weighted average interest rate 2.30% 2.15%
Total deposits, weighted average interest rate 1.57% 1.61%