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Investments (Narrative) (Details)
shares in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2020
USD ($)
Sep. 30, 2021
USD ($)
investment
investments
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
investment
investments
shares
Sep. 30, 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 $ (331,000) $ 0 $ (1,301,000) $ 0  
Stock issued by Federal Home Loan Bank   40,500,000   40,500,000   $ 45,400,000
Non-marketable equity securities   9,600,000   9,600,000   11,600,000
Available for sale securities, realized gain (loss)   $ 8,082,000 $ 21,425,000 $ 33,119,000 $ 54,972,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment   36   36    
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations   $ 0   $ 0    
Investment value deemed to be OTTI       0    
Investment securities, aggregate carrying value, pledged as collateral   5,500,000,000   5,500,000,000   $ 4,600,000,000
Debt Securities, Accrued Interest, WriteOff   0   0    
Held-to-maturity securities   0   0    
Past due securities   $ 0   $ 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, continuous unrealized loss position, 12 months or longer, number of positions | investments   34   34    
Corporate Bonds            
Schedule of Investments [Line Items]            
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investments   2   2    
Visa Class B Common Stock            
Schedule of Investments [Line Items]            
Investment owned (in shares) | shares   354   354    
Investment owned, fair value   $ 0   $ 0