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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment securities available for sale:
Fair Value, Less than 12 months	$ 5,615,772	$ 5,257,891
Unrealized Losses, Less than 12 months	41,644	83,342
Fair Value, 12 months or more	406,480	362,351
Unrealized Losses, Greater than 12 months	5,396	4,689
Fair Value, Total	6,022,252	5,620,242
Unrealized Losses, Total	47,040	88,031
U. S. Treasury
Investment securities available for sale:
Fair Value, Less than 12 months	1,616,324	807,822
Unrealized Losses, Less than 12 months	3,019	935
Fair Value, 12 months or more	0	0
Unrealized Losses, Greater than 12 months	0	0
Fair Value, Total	1,616,324	807,822
Unrealized Losses, Total	3,019	935
Government Agency
Investment securities available for sale:
Unrealized Losses, Total		0
Mortgage Backed Securities
Investment securities available for sale:
Fair Value, Less than 12 months	3,989,074	4,442,700
Unrealized Losses, Less than 12 months	38,441	82,161
Fair Value, 12 months or more	406,480	362,351
Unrealized Losses, Greater than 12 months	5,396	4,689
Fair Value, Total	4,395,554	4,805,051
Unrealized Losses, Total	43,837	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	5,025
Unrealized Losses, Less than 12 months	10
Fair Value, 12 months or more
Unrealized Losses, Greater than 12 months	0
Fair Value, Total	5,025
Unrealized Losses, Total	10	0
Other Debt Obligations
Investment securities available for sale:
Fair Value, Less than 12 months	5,349	7,369
Unrealized Losses, Less than 12 months	174	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	5,349	7,369
Unrealized Losses, Total	$ 174	$ 246

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