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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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- 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=73527792&loc=d3e27161-111563 + Details
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