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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Held-to-maturity securities
Amortized Cost	$ 2,400	$ 2,400
Estimated Fair Value	2,400	2,400
Carrying Value	2,400	2,400
Available-for-sale securities
Amortized Cost	4,803,160	5,372,594
Gross Unrealized Gains	66,663	65,104
Gross Unrealized Losses	(66,533)	(133,119)
Total investment securities	4,803,290	5,304,579
Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Total investment securities	4,803,290	5,304,579
Reported Value Measurement [Member]
Available-for-sale securities
Total investment securities	4,803,290	5,304,579
Other Debt Obligations [Member]
Held-to-maturity securities
Amortized Cost	2,400	2,400
Estimated Fair Value	2,400	2,400
Carrying Value	2,400	2,400
Collateralized Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	4,513,064	5,096,165
Gross Unrealized Gains	46,900	56,110
Gross Unrealized Losses	(60,700)	(124,574)
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Total investment securities	4,499,264	5,027,701
Collateralized Mortgage Backed Securities [Member] | Reported Value Measurement [Member]
Available-for-sale securities
Total investment securities	4,499,264	5,027,701
US Government Corporations and Agencies Securities [Member]
Available-for-sale securities
Total investment securities	1,551,363	1,799,807
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities
Total investment securities	2,922,948	3,200,042
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Available-for-sale securities
Total investment securities	24,953	27,852
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale securities
Amortized Cost	262,021	248,354
Gross Unrealized Gains	18,662	8,063
Gross Unrealized Losses	(5,563)	(8,007)
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Total investment securities	275,120	248,410
US States and Political Subdivisions Debt Securities [Member] | Reported Value Measurement [Member]
Available-for-sale securities
Total investment securities	275,120	248,410
Equity Securities [Member]
Available-for-sale securities
Amortized Cost	28,075	28,075
Gross Unrealized Gains	1,101	931
Gross Unrealized Losses	(270)	(538)
Equity Securities [Member] | Estimate of Fair Value Measurement [Member]
Available-for-sale securities
Total investment securities	28,906	28,468
Equity Securities [Member] | Reported Value Measurement [Member]
Available-for-sale securities
Total investment securities	$ 28,906	$ 28,468

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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