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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | $ 95,519 | $ 100,011
Unrealized Losses - Less Than 12 Months | (304) | (599)
Fair Value - 12 Months of More | 159,818 | 621,294
Unrealized Losses - 12 Months or More | (2,437) | (23,937)
Fair Value | 255,337 | 721,305
Unrealized losses | $ (2,741) | $ (24,536)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 78 | 300
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 | $ 24,439 | 36,218
Unrealized Losses - Less Than 12 Months | (169) | (281)
Fair Value - 12 Months of More | 0 | 28,437
Unrealized Losses - 12 Months or More | 0 | (613)
Fair Value | 24,439 | 64,655
Unrealized losses | $ (169) | $ (894)
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 9 | 114
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 | $ 36,108 | 46,459
Unrealized Losses - Less Than 12 Months | (50) | (252)
Fair Value - 12 Months of More | 86,109 | 364,430
Unrealized Losses - 12 Months or More | (788) | (13,272)
Fair Value | 122,217 | 410,889
Unrealized losses | $ (838) | $ (13,524)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 40 | 117
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 | $ 34,972 | $ 5,956
Unrealized Losses - Less Than 12 Months | (85) | (40)
Fair Value - 12 Months of More | 73,709 | 227,461
Unrealized Losses - 12 Months or More | (1,649) | (10,031)
Fair Value | 108,681 | 233,417
Unrealized losses | $ (1,734) | $ (10,071)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 29 | 63
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)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 6

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