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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available-for-Sale |  |
Amortized Cost | $ 1,436,714 | $ 1,299,980
Gross Unrealized/Unrecognized Holding Gains | 10,366 | 15,010
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,814 | 13,075
Estimated Fair Value | 1,436,266 | 1,301,915
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 149,302 | 140,562
Gross Unrealized/Unrecognized Holding Gains | 2,260 |
Gross Unrealized/Unrecognized Holding Losses | 134 |
Estimated Fair Value | 151,428 | 143,490
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Securities Available-for-Sale |  |
Amortized Cost | 527,605 | 546,886
Gross Unrealized/Unrecognized Holding Gains |  | 11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,542 | 8,833
Estimated Fair Value | 522,063 | 538,064
Obligations of States and Political Subdivisions |  |
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 48,190 |
Gross Unrealized/Unrecognized Holding Gains | 734 |
Estimated Fair Value | 48,924 |
U.S. Government sponsored entity asset-backed securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 907,989 | 751,974
Gross Unrealized/Unrecognized Holding Gains | 8,776 | 13,421
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,272 | 4,242
Estimated Fair Value | 911,493 | 761,153
Securities Held-to-Maturity |  |
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively) | 101,112 | 140,562
Gross Unrealized/Unrecognized Holding Gains | 1,526 | 3,088
Gross Unrealized/Unrecognized Holding Losses | 134 | 160
Estimated Fair Value | 102,504 | 143,490
Equity securities |  |
Securities Available-for-Sale |  |
Amortized Cost | 1,120 | 1,120
Gross Unrealized/Unrecognized Holding Gains | 1,590 | 1,578
Estimated Fair Value | $ 2,710 | $ 2,698

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