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Investments (Unrealized Losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment securities available for sale:    
Fair Value, Less than 12 months $ 5,401,671 $ 5,257,891
Unrealized Losses, Less than 12 months 57,808 83,342
Fair Value, 12 months or more 361,488 362,351
Unrealized Losses, Greater than 12 months 4,569 4,689
Fair Value, Total 5,763,159 5,620,242
Unrealized Losses, Total 62,377 88,031
U. S. Treasury    
Investment securities available for sale:    
Fair Value, Less than 12 months 1,068,144 807,822
Unrealized Losses, Less than 12 months 1,554 935
Fair Value, 12 months or more 0 0
Unrealized Losses, Greater than 12 months 0 0
Fair Value, Total 1,068,144 807,822
Unrealized Losses, Total 1,554 935
Government Agency    
Investment securities available for sale:    
Unrealized Losses, Total 0 0
Mortgage Backed Securities    
Investment securities available for sale:    
Fair Value, Less than 12 months 4,318,258 4,442,700
Unrealized Losses, Less than 12 months 56,017 82,161
Fair Value, 12 months or more 361,488 362,351
Unrealized Losses, Greater than 12 months 4,569 4,689
Fair Value, Total 4,679,746 4,805,051
Unrealized Losses, Total 60,586 86,850
Equity Securities    
Investment securities available for sale:    
Unrealized Losses, Total 0 0
Corporate Bonds    
Investment securities available for sale:    
Fair Value, Less than 12 months 9,975  
Unrealized Losses, Less than 12 months 25  
Fair Value, 12 months or more 0  
Unrealized Losses, Greater than 12 months 0  
Fair Value, Total 9,975  
Unrealized Losses, Total 25 0
Other Debt Obligations    
Investment securities available for sale:    
Fair Value, Less than 12 months 5,294 7,369
Unrealized Losses, Less than 12 months 212 246
Fair Value, 12 months or more 0 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 0  
Unrealized Losses, Greater than 12 months   0
Fair Value, Total 5,294 7,369
Unrealized Losses, Total $ 212 $ 246