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Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
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	4,492,261	4,894,428
Gross Unrealized Gains	68,833	68,516
Gross Unrealized Losses	(28,311)	(50,981)
Total investment securities	4,532,783	4,911,963
Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	4,532,783	4,911,963
Carrying Value
Available-for-sale securities
Total investment securities	4,532,783	4,911,963
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,170,907	4,597,590
Gross Unrealized Gains	48,841	47,960
Gross Unrealized Losses	(22,074)	(45,178)
Residential mortgage-backed securities | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	4,197,674	4,600,372
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Total investment securities	4,197,674	4,600,372
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Total investment securities	1,287,276	1,503,774
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Total investment securities	2,888,638	3,072,535
Mortgage-backed securities by non-government entities
Available-for-sale securities
Total investment securities	21,760	24,063
States and political subdivisions
Available-for-sale securities
Amortized Cost	293,279	268,763
Gross Unrealized Gains	18,811	19,131
Gross Unrealized Losses	(6,085)	(5,618)
States and political subdivisions | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	306,005	282,276
States and political subdivisions | Carrying Value
Available-for-sale securities
Total investment securities	306,005	282,276
Other securities
Held-to-maturity securities
Amortized Cost	2,400	2,400
Estimated Fair Value	2,400	2,400
Carrying Value	2,400	2,400
Other
Available-for-sale securities
Amortized Cost	28,075	28,075
Gross Unrealized Gains	1,181	1,425
Gross Unrealized Losses	(152)	(185)
Other | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	29,104	29,315
Other | Carrying Value
Available-for-sale securities
Total investment securities	$ 29,104	$ 29,315

X

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