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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities Available-for-Sale |  |
Amortized Cost | $ 1,028,883 | $ 1,097,645
Gross Unrealized/Unrecognized Holding Gains | 453 | 4,645
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 25,915 | 10,409
Estimated Fair Value | 1,003,421 | 1,091,881
Debt Securities Held-to-Maturity |  |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 351,808 | 357,197
Gross Unrealized/Unrecognized Holding Gains | 3,289 | 7,333
Gross Unrealized/Unrecognized Holding Losses | 3,675 | 751
Estimated Fair Value | 351,422 | 363,779
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Debt Securities Available-for-Sale |  |
Amortized Cost |  | 245,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 2,280
Estimated Fair Value |  | 242,720
Obligations of States and Political Subdivisions |  |
Debt Securities Held-to-Maturity |  |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 305,278 | 300,412
Gross Unrealized/Unrecognized Holding Gains | 3,202 | 6,575
Gross Unrealized/Unrecognized Holding Losses | 2,672 | 713
Estimated Fair Value | 305,808 | 306,274
U.S. Government sponsored entity asset-backed securities |  |
Debt Securities Available-for-Sale |  |
Amortized Cost | 1,028,883 | 852,645
Gross Unrealized/Unrecognized Holding Gains | 453 | 4,645
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 25,915 | 8,129
Estimated Fair Value | 1,003,421 | 849,161
Debt Securities Held-to-Maturity |  |
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively) | 46,530 | 56,785
Gross Unrealized/Unrecognized Holding Gains | 87 | 758
Gross Unrealized/Unrecognized Holding Losses | 1,003 | 38
Estimated Fair Value | $ 45,614 | $ 57,505

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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