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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | $ 10,876 | $ 100,011
Unrealized Losses - Less Than 12 Months | (46) | (599)
Fair Value - 12 Months of More | 582,441 | 621,294
Unrealized Losses - 12 Months or More | (13,723) | (23,937)
Fair Value | 593,317 | 721,305
Unrealized losses | (13,769) | (24,536)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 509
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (5)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 426 | 411
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (19)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 426 | 920
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3) | (24)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 2,017 | 36,218
Unrealized Losses - Less Than 12 Months | 0 | (281)
Fair Value - 12 Months of More | 9,941 | 28,437
Unrealized Losses - 12 Months or More | (105) | (613)
Fair Value | 11,958 | 64,655
Unrealized losses | (105) | (894)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 509
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (5)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 426 | 411
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3) | (19)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 426 | 920
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (3) | (24)
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 | 8,859 | 46,459
Unrealized Losses - Less Than 12 Months | (46) | (252)
Fair Value - 12 Months of More | 347,541 | 364,430
Unrealized Losses - 12 Months or More | (6,403) | (13,272)
Fair Value | 356,400 | 410,889
Unrealized losses | (6,449) | (13,524)
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 | 0 | 5,956
Unrealized Losses - Less Than 12 Months | 0 | (40)
Fair Value - 12 Months of More | 224,959 | 227,461
Unrealized Losses - 12 Months or More | (7,215) | (10,031)
Fair Value | 224,959 | 233,417
Unrealized losses | $ (7,215) | (10,071)
Subordinated corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months |  | 11,378
Unrealized Losses - Less Than 12 Months |  | (26)
Fair Value - 12 Months of More |  | 966
Unrealized Losses - 12 Months or More |  | (21)
Fair Value |  | 12,344
Unrealized losses |  | $ (47)

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