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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | $ 1,949,679 | $ 1,780,952
Gross Unrealized Gains | 51,764 | 9,414
Gross Unrealized (Losses) | (1,949) | (15,545)
Estimated Fair Value | 1,999,494 | 1,774,821
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | 4,462 |
Gross Unrealized Gains | 18 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | 4,480 |
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | 485,192 | 466,588
Gross Unrealized Gains | 24,566 | 3,844
Gross Unrealized (Losses) | (11) | (1,941)
Estimated Fair Value | 509,747 | 468,491
Corporate and other bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | 202,935 | 167,561
Gross Unrealized Gains | 3,887 | 1,118
Gross Unrealized (Losses) | (509) | (983)
Estimated Fair Value | 206,313 | 167,696
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | 1,253,541 | 1,138,034
Gross Unrealized Gains | 23,293 | 4,452
Gross Unrealized (Losses) | (1,429) | (12,621)
Estimated Fair Value | 1,275,405 | 1,129,865
Other securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total AFS securities | 3,549 | 8,769
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | $ 3,549 | $ 8,769

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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=118939692&loc=d3e27161-111563 + Details
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