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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | $ 371,387 | $ 324,078
Unrealized Losses - Less Than 12 Months | (9,117) | (3,089)
Fair Value - 12 Months of More | 390,045 | 398,360
Unrealized Losses - 12 Months or More | (21,003) | (11,172)
Fair Value | 761,432 | 722,438
Unrealized losses | (30,120) | (14,261)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 63,572 | 9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,119) | (57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,229 | 9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (475) | (180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 73,801 | 18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,594) | (237)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 1,517 |
Unrealized Losses - Less Than 12 Months | (3) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 1,517 |
Unrealized losses | (3) |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 63,572 | 9,317
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,119) | (57)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,229 | 9,436
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (475) | (180)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 73,801 | 18,753
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,594) | (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 | 240,208 | 221,466
Unrealized Losses - Less Than 12 Months | (6,256) | (2,393)
Fair Value - 12 Months of More | 240,607 | 233,971
Unrealized Losses - 12 Months or More | (11,457) | (5,078)
Fair Value | 480,815 | 455,437
Unrealized losses | (17,713) | (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 | 128,698 | 102,612
Unrealized Losses - Less Than 12 Months | (2,837) | (696)
Fair Value - 12 Months of More | 149,438 | 164,389
Unrealized Losses - 12 Months or More | (9,546) | (6,094)
Fair Value | 278,136 | 267,001
Unrealized losses | (12,383) | $ (6,790)
Subordinated corporate bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 964 |
Unrealized Losses - Less Than 12 Months | (21) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 964 |
Unrealized losses | $ (21) |

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