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Investments (Narrative) (Details)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
investments
investment
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
investments
investment
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2018
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 13,100,000   13,100,000     12,500,000
Accrued Interest receivable excluded from estimate of credit losses 21,300,000   21,300,000      
Available for sale securities, realized gains 13,800,000   34,200,000      
Available for sale securities, realized loss 0 $ 0 679,000 $ 0    
Available for sale securities, realized gain (loss) $ 13,752,000 $ 5,719,000 $ 33,547,000 $ 5,719,000 $ 5,700,000  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | investment 47   47      
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 4,530,000,000   4,530,000,000     $ 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 45   45      
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 2   2      
Visa Class B Common Stock            
Schedule of Investments [Line Items]            
Investment owned (in shares) | shares 354   354      
Investment owned $ 0   $ 0