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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment securities available for sale:
Fair Value, Less than 12 months	$ 5,727,435	$ 5,257,891
Unrealized Losses, Less than 12 months	51,080	83,342
Fair Value, 12 months or more	339,826	362,351
Unrealized Losses, Greater than 12 months	4,491	4,689
Fair Value, Total	6,067,261	5,620,242
Unrealized Losses, Total	55,571	88,031
U. S. Treasury
Investment securities available for sale:
Fair Value, Less than 12 months	1,616,134	807,822
Unrealized Losses, Less than 12 months	3,091	935
Fair Value, 12 months or more	0	0
Unrealized Losses, Greater than 12 months	0	0
Fair Value, Total	1,616,134	807,822
Unrealized Losses, Total	3,091	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	4,101,002	4,442,700
Unrealized Losses, Less than 12 months	47,735	82,161
Fair Value, 12 months or more	339,826	362,351
Unrealized Losses, Greater than 12 months	4,491	4,689
Fair Value, Total	4,440,828	4,805,051
Unrealized Losses, Total	52,226	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	5,000
Unrealized Losses, Less than 12 months	38
Fair Value, 12 months or more	0
Unrealized Losses, Greater than 12 months	0
Fair Value, Total	5,000
Unrealized Losses, Total	38	0
Other Debt Obligations
Investment securities available for sale:
Fair Value, Less than 12 months	5,299	7,369
Unrealized Losses, Less than 12 months	216	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	5,299	7,369
Unrealized Losses, Total	$ 216	$ 246

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