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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 1,621,047 $ 1,632,723  
Collateral for repurchase agreements     448,000    
Loss on prepayments of FHLB advances     $ 0   $ 0
Weighted Average Coupon Rate     2.05% 2.34%  
Risk Management and Shared Serivies [Member]          
Debt Instrument [Line Items]          
Loss on prepayments of FHLB advances       $ 44,650  
Maximum          
Debt Instrument [Line Items]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged     $ 8,400,000    
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%        
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%