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SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | $ 1,900,313 | $ 1,893,427
Gross Unrealized Gains | 81,556 | 53,918
Gross Unrealized (Losses) | (8,966) | (1,900)
Total AFS securities, Estimated Fair Value | 1,972,903 | 1,945,445
U.S. government and agency securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 17,631 | 21,149
Gross Unrealized Gains | 365 | 209
Gross Unrealized (Losses) | (34) | (38)
Total AFS securities, Estimated Fair Value | 17,962 | 21,320
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 515,914 | 421,344
Gross Unrealized Gains | 31,367 | 25,776
Gross Unrealized (Losses) | (555) | (29)
Total AFS securities, Estimated Fair Value | 546,726 | 447,091
Corporate and other bonds |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 122,232 | 134,342
Gross Unrealized Gains | 2,185 | 1,991
Gross Unrealized (Losses) | (3,449) | (374)
Total AFS securities, Estimated Fair Value | 120,968 | 135,959
Total mortgage-back securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 1,241,446 | 1,313,513
Gross Unrealized Gains | 47,639 | 25,942
Gross Unrealized (Losses) | (4,928) | (1,459)
Total AFS securities, Estimated Fair Value | 1,284,157 | 1,337,996
Commercial |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 353,684 | 416,904
Gross Unrealized Gains | 13,819 | 8,786
Gross Unrealized (Losses) | (56) | (643)
Total AFS securities, Estimated Fair Value | 367,447 | 425,047
Residential |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 887,762 | 896,609
Gross Unrealized Gains | 33,820 | 17,156
Gross Unrealized (Losses) | (4,872) | (816)
Total AFS securities, Estimated Fair Value | 916,710 | 912,949
Other securities |  |
Debt Securities, Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |
Total AFS securities | 3,090 | 3,079
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Total AFS securities, Estimated Fair Value | $ 3,090 | $ 3,079

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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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