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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, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | $ 1,893,427 | $ 1,780,952
Gross Unrealized Gains | 53,918 | 9,414
Gross Unrealized (Losses) | (1,900) | (15,545)
Total AFS securities, Estimated Fair Value | 1,945,445 | 1,774,821
U.S. government and agency securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | 4,487 |
Gross Unrealized Gains | 11 |
Gross Unrealized (Losses) | 0 |
Total AFS securities, Estimated Fair Value | 4,498 |
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | 417,397 | 466,588
Gross Unrealized Gains | 25,624 | 3,844
Gross Unrealized (Losses) | (29) | (1,941)
Total AFS securities, Estimated Fair Value | 442,992 | 468,491
Corporate and other bonds |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | 259,213 | 167,561
Gross Unrealized Gains | 4,403 | 1,118
Gross Unrealized (Losses) | (546) | (983)
Total AFS securities, Estimated Fair Value | 263,070 | 167,696
Mortgage-backed securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | 1,209,251 | 1,138,034
Gross Unrealized Gains | 23,880 | 4,452
Gross Unrealized (Losses) | (1,325) | (12,621)
Total AFS securities, Estimated Fair Value | 1,231,806 | 1,129,865
Other securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities, Amortized Cost | 3,079 | 8,769
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Total AFS securities, Estimated Fair Value | $ 3,079 | $ 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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