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Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
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	4,132,694	4,218,841
Gross Unrealized Gains	31,679	29,343
Gross Unrealized Losses	(42,670)	(70,835)
Total Investment Securities	4,121,703	4,177,349
Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	4,121,703	4,177,349
Carrying Value
Available-for-sale securities
Total Investment Securities	4,121,703	4,177,349
Residential mortgage-backed securities
Available-for-sale securities
Amortized Cost	3,865,818	3,946,144
Gross Unrealized Gains	21,184	18,246
Gross Unrealized Losses	(42,146)	(69,920)
Residential mortgage-backed securities | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	3,844,856	3,894,470
Residential mortgage-backed securities | Carrying Value
Available-for-sale securities
Total Investment Securities	3,844,856	3,894,470
Mortgage-backed securities by Ginnie Mae
Available-for-sale securities
Total Investment Securities	749,704	850,033
Mortgage-backed securities by Fannie Mae and Freddie Mac
Available-for-sale securities
Total Investment Securities	3,095,152	3,026,832
Mortgage-backed securities by non-government entities
Available-for-sale securities
Total Investment Securities		17,605
Obligations of states and political subdivisions
Available-for-sale securities
Amortized Cost	238,801	244,622
Gross Unrealized Gains	10,248	10,783
Gross Unrealized Losses	(129)	(433)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	248,920	254,972
Obligations of states and political subdivisions | Carrying Value
Available-for-sale securities
Total Investment Securities	248,920	254,972
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	247	314
Gross Unrealized Losses	(395)	(482)
Equity securities | Assets/liabilities measured at fair value
Available-for-sale securities
Total Investment Securities	27,927	27,907
Equity securities | Carrying Value
Available-for-sale securities
Total Investment Securities	$ 27,927	$ 27,907

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

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