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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment securities available for sale
Cost	$ 6,507,032	$ 6,885,797
Gross Unrealized Gains	54,774	6,367
Gross Unrealized Losses	4,226	30,871
Fair Value	6,557,580	6,861,293
Investment securities held to maturity
Cost	156	255
U. S. Treasury
Investment securities available for sale
Cost	1,538,211	1,675,996
Gross Unrealized Gains	3,268	4
Gross Unrealized Losses	0	1,118
Fair Value	1,541,479	1,674,882
Government Agency
Investment securities available for sale
Cost	355,014	498,804
Gross Unrealized Gains	531	230
Gross Unrealized Losses	0	374
Fair Value	355,545	498,660
Mortgage Backed Securities
Investment securities available for sale
Cost	4,489,218	4,692,447
Gross Unrealized Gains	48,888	5,120
Gross Unrealized Losses	2,275	29,369
Fair Value	4,535,831	4,668,198
Investment securities held to maturity
Cost	156	255
Held To Maturity Securities Accumulated Unrecognized Holding Gain	9	10
Held To Maturity Securities Accumulated Unrecognized Holding Loss	0	0
Fair Value	165	265
Equity Securities
Investment securities available for sale
Cost	81,114	7,935
Gross Unrealized Gains	2,062	968
Gross Unrealized Losses	1,786	10
Fair Value	81,390	8,893
Corporate Bonds
Investment securities available for sale
Cost	41,360	8,500
Gross Unrealized Gains	25	0
Gross Unrealized Losses	0	0
Fair Value	41,385	8,500
Other Debt Obligations
Investment securities available for sale
Cost	2,115	2,115
Gross Unrealized Gains	0	45
Gross Unrealized Losses	165	0
Fair Value	$ 1,950	$ 2,160

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