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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Assets:        
Cash and cash equivalents, Carrying Value $ 1,947,931 $ 741,870 $ 1,474,955 $ 2,528,169
Cash and cash equivalents, Estimated Fair Value 1,947,931 741,870    
FHLB stock, Carrying Value [1] 714,005 647,562    
FHLB stock, Estimated Fair Value [1] 714,005 647,562    
Loans and leases, net, Carrying Value 42,806,691 41,746,517    
Loans and leases, net, Estimated Fair Value 42,376,214 41,699,929    
Financial Liabilities:        
Deposits, Carrying Value 32,436,813 31,657,132    
Deposits, Estimated Fair Value 32,466,013 31,713,945    
Borrowed funds, Carrying Value 16,083,544 14,557,593    
Borrowed funds, Estimated Fair Value 16,794,338 14,882,776    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents, Carrying Value 1,947,931 741,870    
Financial Liabilities:        
Deposits, Carrying Value [2] 22,106,133 17,442,274    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
FHLB stock, Carrying Value [1] 714,005 647,562    
Financial Liabilities:        
Deposits, Carrying Value [3] 10,359,880 14,271,671    
Borrowed funds, Carrying Value 16,794,338 14,882,776    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Loans and leases, net, Carrying Value $ 42,376,214 $ 41,699,929    
[1] Carrying value and estimated fair value are at cost.
[2] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[3] Certificates of deposit.