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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | $ 0 | $ 100,011
Unrealized Losses - Less Than 12 Months | 0 | (599)
Fair Value - 12 Months of More | 387,390 | 621,294
Unrealized Losses - 12 Months or More | (5,247) | (23,937)
Fair Value | 387,390 | 721,305
Unrealized losses | (5,247) | (24,536)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 509
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (5)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 411
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (19)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 920
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | (24)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | 0 | 36,218
Unrealized Losses - Less Than 12 Months | 0 | (281)
Fair Value - 12 Months of More | 4,051 | 28,437
Unrealized Losses - 12 Months or More | (26) | (613)
Fair Value | 4,051 | 64,655
Unrealized losses | (26) | (894)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 509
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (5)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 411
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (19)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 920
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss |  | (24)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | 0 | 46,459
Unrealized Losses - Less Than 12 Months | 0 | (252)
Fair Value - 12 Months of More | 246,463 | 364,430
Unrealized Losses - 12 Months or More | (2,203) | (13,272)
Fair Value | 246,463 | 410,889
Unrealized losses | (2,203) | (13,524)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [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 | 136,876 | 227,461
Unrealized Losses - 12 Months or More | (3,018) | (10,031)
Fair Value | 136,876 | 233,417
Unrealized losses | $ (3,018) | (10,071)
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [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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