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Investment Securities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Held-to-maturity securities |  |
Amortized cost | $ 2,400,000 | $ 2,400,000
Estimated fair value | 2,400,000 | 2,400,000
Carrying Value | 2,400,000 | 2,400,000
Available-for-sale securities |  |
Amortized Cost | 4,196,263,000 | 4,218,841,000
Gross Unrealized Gains | 22,274,000 | 29,343,000
Gross Unrealized Losses | (66,467,000) | (70,835,000)
Total Investment Securities | 4,152,070,000 | 4,177,349,000
Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,152,070,000 | 4,177,349,000
Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,152,070,000 | 4,177,349,000
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 3,943,092,000 | 3,946,144,000
Gross Unrealized Gains | 14,110,000 | 18,246,000
Gross Unrealized Losses | (65,969,000) | (69,920,000)
Residential mortgage-backed securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,891,233,000 | 3,894,470,000
Residential mortgage-backed securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,891,233,000 | 3,894,470,000
Mortgage-backed securities by Ginnie Mae |  |
Available-for-sale securities |  |
Total Investment Securities | 654,063,000 | 850,033,000
Mortgage-backed securities by Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Total Investment Securities | 3,237,170,000 | 3,026,832
Mortgage-backed securities by non-government entities |  |
Available-for-sale securities |  |
Total Investment Securities |  | 17,605,000
Obligations of states and political subdivisions |  |
Available-for-sale securities |  |
Amortized Cost | 225,096,000 | 244,622,000
Gross Unrealized Gains | 7,871,000 | 10,783,000
Gross Unrealized Losses | (16,000) | (433,000)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 232,951,000 | 254,972,000
Obligations of states and political subdivisions | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 232,951,000 | 254,972,000
Other securities |  |
Held-to-maturity securities |  |
Amortized cost | 2,400,000 | 2,400,000
Estimated fair value | 2,400,000 | 2,400,000
Carrying Value | 2,400,000 | 2,400,000
Equity securities |  |
Available-for-sale securities |  |
Amortized Cost | 28,075,000 | 28,075,000
Gross Unrealized Gains | 293,000 | 314,000
Gross Unrealized Losses | (482,000) | (482,000)
Equity securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 27,886,000 | 27,907,000
Equity securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | $ 27,886,000 | $ 27,907,000

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