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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total securities available for sale, Amortized Cost | $ 1,780,952 | $ 971,339
Gross Unrealized Gains | 9,414 | 10,569
Gross Unrealized (Losses) | (15,545) | (7,686)
Available for sale securities, Estimated fair value | 1,774,821 | 974,222
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total securities available for sale, Amortized Cost | 466,588 | 295,546
Gross Unrealized Gains | 3,844 | 6,842
Gross Unrealized (Losses) | (1,941) | (564)
Available for sale securities, Estimated fair value | 468,491 | 301,824
Corporate bonds |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total securities available for sale, Amortized Cost | 167,561 | 113,625
Gross Unrealized Gains | 1,118 | 1,131
Gross Unrealized (Losses) | (983) | (876)
Available for sale securities, Estimated fair value | 167,696 | 113,880
Mortgage-backed securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total securities available for sale, Amortized Cost | 1,138,034 | 552,431
Gross Unrealized Gains | 4,452 | 2,596
Gross Unrealized (Losses) | (12,621) | (6,169)
Available for sale securities, Estimated fair value | 1,129,865 | 548,858
Other securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total securities available for sale, Amortized Cost | 8,769 | 9,737
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | (77)
Available for sale securities, Estimated fair value | $ 8,769 | $ 9,660

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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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