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Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
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	4,378,080	4,196,034
Gross Unrealized Gains	60,418	50,165
Gross Unrealized Losses	(10,928)	(46,827)
Total Investment Securities	4,427,570	4,199,372
Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	4,427,570	4,199,372
Carrying Value
Available-for-sale securities
Total Investment Securities	4,427,570	4,199,372
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	4,104,579	3,908,809
Gross Unrealized Gains	42,699	30,959
Gross Unrealized Losses	(10,805)	(46,557)
Residential mortgage-backed securities | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	4,136,473	3,893,211
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Total Investment Securities	4,136,473	3,893,211
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Total Investment Securities	956,003	1,147,143
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Total Investment Securities	3,161,960	2,724,839
Mortgage-backed securities by non-government entities
Available-for-sale securities
Total Investment Securities	18,511	21,229
Obligations of states and political subdivisions
Available-for-sale securities
Amortized Cost	245,426	259,150
Gross Unrealized Gains	16,826	18,579
Gross Unrealized Losses	(1)	(25)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	262,251	277,704
Obligations of states and political subdivisions | Carrying Value
Available-for-sale securities
Total Investment Securities	262,251	277,704
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
Equity securities
Available-for-sale securities
Amortized Cost	28,075	28,075
Gross Unrealized Gains	893	627
Gross Unrealized Losses	(122)	(245)
Equity securities | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	28,846	28,457
Equity securities | Carrying Value
Available-for-sale securities
Total Investment Securities	$ 28,846	$ 28,457

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

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