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Investment Securities (Details) - USD ($) $ in Thousands | Jun. 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 | 4,169,804 | 4,196,034
Gross Unrealized Gains | 71,218 | 50,165
Gross Unrealized Losses | (7,703) | (46,827)
Total Investment Securities | 4,233,319 | 4,199,372
Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,233,319 | 4,199,372
Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,233,319 | 4,199,372
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 3,883,171 | 3,908,809
Gross Unrealized Gains | 50,219 | 30,959
Gross Unrealized Losses | (7,596) | (46,557)
Residential mortgage-backed securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,925,794 | 3,893,211
Residential mortgage-backed securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,925,794 | 3,893,211
Mortgage-backed securities by Ginnie Mae |  |
Available-for-sale securities |  |
Total Investment Securities | 1,044,110 | 1,147,143
Mortgage-backed securities by Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Total Investment Securities | 2,862,311 | 2,724,839
Mortgage-backed securities by non-government entities |  |
Available-for-sale securities |  |
Total Investment Securities | 19,373 | 21,229
States and political subdivisions |  |
Available-for-sale securities |  |
Amortized Cost | 258,558 | 259,150
Gross Unrealized Gains | 20,038 | 18,579
Gross Unrealized Losses |  | (25)
States and political subdivisions | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 278,596 | 277,704
States and political subdivisions | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 278,596 | 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
Other |  |
Available-for-sale securities |  |
Amortized Cost | 28,075 | 28,075
Gross Unrealized Gains | 961 | 627
Gross Unrealized Losses | (107) | (245)
Other | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 28,929 | 28,457
Other | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | $ 28,929 | $ 28,457

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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