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Investment Securities (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 01, 2018
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Securities                    
Debt Securities, Available-for-sale, Sold at Par Value         $ 108,000,000          
Investment Securities (Textuals) [Abstract]                    
Transfer of held to maturity securities to available for sale securities (adoption of ASU 2019-04)     $ 692,000,000         $ 692,414,000 $ 0 $ 0
Debt Securities AFS Principal Sold     157,000,000              
Debt Securities, Available-for-sale, Gain (Loss)     $ 3,000,000              
Carrying amount of Securities Sold             $ 1,200,000,000      
Visa B Restricted Stock Donated       42,039            
Visa Restricted Shares Owned   77,000   77,000            
Debt Securities, Available-for-sale, Sold at Par Value         $ 108,000,000          
Debt Securities, Held-to-maturity, Sold, Amount                   18,000,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)                   $ 434,000
Pledged Financial Instruments, Not Separately Reported, Securities   $ 2,600,000,000           2,600,000,000 3,000,000,000.0  
Federal Home Loan Bank Stock   149,000,000           149,000,000 173,000,000  
Federal Reserve Bank Stock   78,000,000           78,000,000 77,000,000  
Equity Securities with Readily Determined Fair Value   2,000,000           2,000,000 2,000,000  
Equity Securities without Readily Determinable Fair Value, Amount   $ 13,000,000           $ 13,000,000 $ 0  
Bank Mutual [Member]                    
Investment Securities                    
Debt Securities, Available-for-sale, Sold at Par Value $ 453,000,000                  
Investment Securities (Textuals) [Abstract]                    
Debt Securities, Available-for-sale, Sold at Par Value $ 453,000,000                  
Securities Sold [Member]                    
Investment Securities                    
Taxable Equivalent Yield         3.08%          
Reinvestment [Member]                    
Investment Securities                    
Taxable Equivalent Yield         3.51%          
Commercial mortgage-related securities | GNMA [Member]                    
Investment Securities                    
Debt Securities, Available-for-sale, Sold at Par Value           $ 40,000,000        
Investment Securities (Textuals) [Abstract]                    
Debt Securities, Available-for-sale, Sold at Par Value           $ 40,000,000