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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | $ 250,616 | $ 324,078
Unrealized Losses - Less Than 12 Months | (4,806) | (3,089)
Fair Value - 12 Months of More | 509,704 | 398,360
Unrealized Losses - 12 Months or More | (29,056) | (11,172)
Fair Value | 760,320 | 722,438
Unrealized losses | (33,862) | (14,261)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 67,328 | 9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,755) | (57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,546 | 9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (686) | (180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 79,874 | 18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,441) | (237)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 1,516 |
Unrealized Losses - Less Than 12 Months | (4) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 1,516 |
Unrealized losses | (4) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 67,328 | 9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,755) | (57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,546 | 9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (686) | (180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 79,874 | 18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (2,441) | (237)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 120,098 | 221,466
Unrealized Losses - Less Than 12 Months | (2,544) | (2,393)
Fair Value - 12 Months of More | 328,180 | 233,971
Unrealized Losses - 12 Months or More | (17,344) | (5,078)
Fair Value | 448,278 | 455,437
Unrealized losses | (19,888) | (7,471)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 123,951 | 102,612
Unrealized Losses - Less Than 12 Months | (2,220) | (696)
Fair Value - 12 Months of More | 181,524 | 164,389
Unrealized Losses - 12 Months or More | (11,712) | (6,094)
Fair Value | 305,475 | 267,001
Unrealized losses | (13,932) | $ (6,790)
Subordinated corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 5,051 |
Unrealized Losses - Less Than 12 Months | (38) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 5,051 |
Unrealized losses | $ (38) |

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