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Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Nov. 30, 2014
Jun. 30, 2019
Dec. 31, 2018
Aug. 31, 2018
Long-Term Funding        
FHLB advances   $ 2,742,941 $ 3,574,371  
Subordinated Borrowing [Line Items]        
Carrying Value of Securities Purchased under Agreements to Resell and Deposits Paid for Securities Borrowed   143,000    
Two Thousand Fourteen Subordinated Notes        
Subordinated Borrowing [Line Items]        
Junior Subordinated Debentures Issued $ 250,000      
Debt Instrument, Term 10 years      
Subordinated Borrowing, Interest Rate 4.25%      
Two Thousand Eighteen Senior Notes [Member] [Domain]        
Long-Term Funding        
New Senior Debt Issued       $ 300,000
Debt Instrument, Interest Rate, Stated Percentage       3.50%
Two Thousand Fourteen Senior Notes [Member]        
Long-Term Funding        
New Senior Debt Issued $ 250,000      
Debt Instrument, Interest Rate, Stated Percentage 2.75%      
FHLBDecreaseinAdvances [Domain]        
Long-Term Funding        
FHLB advances   831,000    
FLHB Advances, Putable [Domain]        
Long-Term Funding        
FHLB advances   $ 2,600,000    
FHLB Short Term Advances [Member]        
Long-Term Funding        
FHLB Put Contractual Maturity Weighted Average Life1   7 months 2 days    
FHLB Long Term Advances [Member]        
Long-Term Funding        
FHLB Put Contractual Maturity Weighted Average Life1   5 years 8 months 8 days