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Short and Long-term Funding Short and Long-term Funding (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 13, 2018
Nov. 13, 2014
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 1,632,723 $ 3,180,967
Increase Decrease in FHLB Advances     (1,500,000)  
Collateral for repurchase agreements     262,000  
Loss on prepayments of FHLB advances     44,650  
Risk Management and Shared Serivies [Member]        
Debt Instrument [Line Items]        
Loss on prepayments of FHLB advances     45,000  
Maximum        
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged     $ 9,900,000  
Two Thousand Eighteen Senior Notes [Member] [Domain]        
Debt Instrument [Line Items]        
New Senior Debt Issued $ 300,000      
Debt Instrument, Maturity Date Month, Year August 2021      
Debt Instrument Call Date Earliest Month Year July 2021      
Debt Instrument, Interest Rate, Stated Percentage 3.50%      
Finance Leases [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage     1.00%  
Two Thousand Fourteen Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Junior Subordinated Debentures Issued   $ 250,000    
Debt Instrument, Term   10 years    
Debt Instrument, Maturity Date Month, Year   January 2025    
Debt Instrument Call Date Earliest Month Year   October 2024    
Subordinated Borrowing, Interest Rate   4.25%