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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Available-for-Sale |  |
Amortized Cost | $ 1,262,761 | $ 1,436,714
Gross Unrealized/Unrecognized Holding Gains | 7,687 | 10,366
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 12,309 | 10,814
Estimated Fair Value | 1,258,139 | 1,436,266
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively) | 259,833 | 149,302
Gross Unrealized/Unrecognized Holding Gains | 2,074 | 2,260
Gross Unrealized/Unrecognized Holding Losses | 5,235 | 134
Estimated Fair Value | 256,672 | 151,428
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Securities Available-for-Sale |  |
Amortized Cost | 270,000 | 527,605
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,467 | 5,542
Estimated Fair Value | 267,533 | 522,063
Obligations of States and Political Subdivisions |  |
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively) | 188,622 | 48,190
Gross Unrealized/Unrecognized Holding Gains | 977 | 734
Gross Unrealized/Unrecognized Holding Losses | 5,148 |
Estimated Fair Value | 184,451 | 48,924
U.S. Government sponsored entity asset-backed securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 991,642 | 907,989
Gross Unrealized/Unrecognized Holding Gains | 5,372 | 8,776
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 9,842 | 5,272
Estimated Fair Value | 987,172 | 911,493
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively) | 71,211 | 101,112
Gross Unrealized/Unrecognized Holding Gains | 1,097 | 1,526
Gross Unrealized/Unrecognized Holding Losses | 87 | 134
Estimated Fair Value | 72,221 | 102,504
Equity securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 1,119 | 1,120
Gross Unrealized/Unrecognized Holding Gains | 2,315 | 1,590
Estimated Fair Value | $ 3,434 | $ 2,710

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