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Investments (Narrative) (Details)
shares in Thousands
3 Months Ended
Nov. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
investments
investment
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]        
Unrealized gain at the date of transfer $ 5,900,000      
Other Comprehensive Income Loss Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity Arising During Period Net Of Tax 4,500,000 $ (366,000) $ 0  
Stock issued by Federal Home Loan Bank   40,600,000   $ 45,400,000
Non-marketable equity securities   11,400,000   11,600,000
Available for sale securities, realized gain (loss)   $ 9,207,000 $ 19,795,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment   60    
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations   $ 0    
Investment value deemed to be OTTI   0    
Investment securities, aggregate carrying value, pledged as collateral   4,800,000,000   $ 4,600,000,000
Debt Securities, Accrued Interest, WriteOff   0    
Held-to-maturity securities   0    
Past due securities   $ 0    
Residential mortgage-backed securities        
Schedule of Investments [Line Items]        
Investment securities available for sale transferred to held to maturity amortized cost 1,460,000,000      
Investment securities available for sale transferred to held to maturity fair value $ 1,470,000,000      
Weighted average contractual maturity term 18 years      
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments   54    
Corporate Bonds        
Schedule of Investments [Line Items]        
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments   6    
Visa Class B Common Stock        
Schedule of Investments [Line Items]        
Investment owned (in shares) | shares   354    
Investment owned   $ 0