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Weighted Average Interest Rates for Each Type of Deposit (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amount    
NOW and money market accounts $ 13,069,019 $ 12,549,600
Savings accounts 7,541,566 7,051,622
Certificates of deposit 5,312,487 6,420,598
Non-interest-bearing accounts 2,503,686 2,306,914
Total deposits $ 28,426,758 $ 28,328,734
Percent of Total    
NOW and money market accounts, percent 45.97% 44.30%
Savings accounts, percent 26.53% 24.89%
Certificates of deposit, percent 18.69% 22.67%
Non-interest-bearing accounts, percent 8.81% 8.14%
Total deposits, percent 100.00% 100.00%
Weighted Average Interest Rate    
NOW and money market accounts, weighted average interest rate [1] 0.22% 0.37%
Savings accounts, weighted average interest rate [1] 0.63% 0.60%
Certificates of deposit, weighted average interest rate [1] 0.68% 1.15%
Non-interest-bearing accounts, weighted average interest rate [1] 0.00% 0.00%
Total deposits, weighted average interest rate [1] 0.39% 0.57%
[1] Excludes the effect of purchase accounting adjustments for certain certificates of deposit ("CDs").