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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investment securities available for sale
Cost	$ 6,336,197	$ 6,885,797
Gross Unrealized Gains	52,085	6,367
Gross Unrealized Losses	3,467	30,871
Fair Value	6,384,815	6,861,293
Investment securities held to maturity
Cost	125	255
U. S. Treasury
Investment securities available for sale
Cost	1,547,501	1,675,996
Gross Unrealized Gains	2,030	4
Gross Unrealized Losses	1	1,118
Fair Value	1,549,530	1,674,882
Government Agency
Investment securities available for sale
Cost	169,609	498,804
Gross Unrealized Gains	250	230
Gross Unrealized Losses	0	374
Fair Value	169,859	498,660
Mortgage Backed Securities
Investment securities available for sale
Cost	4,487,083	4,692,447
Gross Unrealized Gains	44,570	5,120
Gross Unrealized Losses	3,283	29,369
Fair Value	4,528,370	4,668,198
Investment securities held to maturity
Cost	125	255
Held To Maturity Securities Accumulated Unrecognized Holding Gain	8	10
Held To Maturity Securities Accumulated Unrecognized Holding Loss	0	0
Fair Value	133	265
Equity Securities
Investment securities available for sale
Cost	88,526	7,935
Gross Unrealized Gains	4,653	968
Gross Unrealized Losses	168	10
Fair Value	93,011	8,893
Corporate Bonds
Investment securities available for sale
Cost	41,363	8,500
Gross Unrealized Gains	582	0
Gross Unrealized Losses	0	0
Fair Value	41,945	8,500
Other Debt Obligations
Investment securities available for sale
Cost	2,115	2,115
Gross Unrealized Gains	0	45
Gross Unrealized Losses	15	0
Fair Value	$ 2,100	$ 2,160

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