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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, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 3,180,967 $ 3,574,371
Collateral for repurchase agreements     153,000  
Maximum        
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged     $ 9,600,000  
Two Thousand Eighteen Senior Notes [Member] [Domain]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Month, Year August 2018      
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%      
Two Thousand Fourteen Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Month, Year   November 2014    
New Senior Debt Issued   $ 250,000    
Debt Instrument, Maturity Date Month, Year   November 2019    
Debt Instrument Call Date Earliest Month Year   October 2019    
Debt Instrument, Interest Rate, Stated Percentage   2.75%    
Debt Instrument, Called Date   October 15, 2019    
Finance Leases [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term     40 years  
Debt Instrument, Maturity Date Month, Year     August 2059  
Debt Instrument, Interest Rate, Stated Percentage     3.99%  
FHLB Decrease in Advances [Member]        
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 393,000  
FLHB Advances, Putable [Domain]        
Debt Instrument [Line Items]        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 1,500,000  
FHLB Long Term Advances [Member]        
Debt Instrument [Line Items]        
FHLB Put Contractual Maturity Weighted Average Life1     3 months 7 days  
FHLB Weighted Average Life to Contractual Maturity     5 years 7 months 28 days  
Two Thousand Fourteen Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Month, Year   November 2014    
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%