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Investment Securities (Details) - USD ($) $ in Thousands	Jun. 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	4,660,311	4,894,428
Gross Unrealized Gains	60,665	68,516
Gross Unrealized Losses	(47,504)	(50,981)
Total investment securities	4,673,472	4,911,963
Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	4,673,472	4,911,963
Carrying Value
Available-for-sale securities
Total investment securities	4,673,472	4,911,963
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,363,026	4,597,590
Gross Unrealized Gains	42,842	47,960
Gross Unrealized Losses	(40,802)	(45,178)
Residential mortgage-backed securities | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	4,365,066	4,600,372
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Total investment securities	4,365,066	4,600,372
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Total investment securities	1,367,593	1,503,774
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Total investment securities	2,974,777	3,072,535
Mortgage-backed securities by non-government entities
Available-for-sale securities
Total investment securities	22,696	24,063
States and political subdivisions
Available-for-sale securities
Amortized Cost	269,210	268,763
Gross Unrealized Gains	16,567	19,131
Gross Unrealized Losses	(6,481)	(5,618)
States and political subdivisions | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	279,296	282,276
States and political subdivisions | Carrying Value
Available-for-sale securities
Total investment securities	279,296	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	1,256	1,425
Gross Unrealized Losses	(221)	(185)
Other | Assets/Liabilities Measured at Fair Value
Available-for-sale securities
Total investment securities	29,110	29,315
Other | Carrying Value
Available-for-sale securities
Total investment securities	$ 29,110	$ 29,315

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