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Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 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 | 4,218,841 | 4,196,034
Gross Unrealized Gains | 29,343 | 50,165
Gross Unrealized Losses | (70,835) | (46,827)
Total Investment Securities | 4,177,349 | 4,199,372
Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,177,349 | 4,199,372
Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,177,349 | 4,199,372
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 3,946,144 | 3,908,809
Gross Unrealized Gains | 18,246 | 30,959
Gross Unrealized Losses | (69,920) | (46,557)
Residential mortgage-backed securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,894,470 | 3,893,211
Residential mortgage-backed securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,894,470 | 3,893,211
Mortgage-backed securities by Ginnie Mae |  |
Available-for-sale securities |  |
Total Investment Securities | 850,033 | 1,147,143
Mortgage-backed securities by Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Total Investment Securities | 3,026,832 | 2,724,839
Mortgage-backed securities by non-government entities |  |
Available-for-sale securities |  |
Total Investment Securities | 17,605 | 21,229
Obligations of states and political subdivisions |  |
Available-for-sale securities |  |
Amortized Cost | 244,622 | 259,150
Gross Unrealized Gains | 10,783 | 18,579
Gross Unrealized Losses | (433) | (25)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 254,972 | 277,704
Obligations of states and political subdivisions | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 254,972 | 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 | 314 | 627
Gross Unrealized Losses | (482) | (245)
Equity securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 27,907 | 28,457
Equity securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | $ 27,907 | $ 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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