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Investments (Narrative) (Details)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
investment
investments
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
investment
investments
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]          
Stock issued by Federal Home Loan Bank $ 45,400,000   $ 45,400,000   $ 43,000,000.0
Non-marketable equity securities 13,500,000   13,500,000   12,500,000
Available for sale securities, realized gain (loss) $ 21,425,000 $ 1,136,000 $ 54,972,000 $ 6,855,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment 38   38    
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 4,480,000,000   4,480,000,000   $ 3,930,000,000
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]          
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to one year | investments 37   37    
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 1   1    
Visa Class B Common Stock          
Schedule of Investments [Line Items]          
Investment owned (in shares) | shares 354   354    
Investment owned $ 0   $ 0