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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Sep. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 26 | 105
Fair Value - Less Than 12 Months | $ 97,865 | $ 259,972
Unrealized Losses - Less Than 12 Months | (1,121) | (2,911)
Fair Value - 12 Months of More | 1,004 | 132,247
Unrealized Losses - 12 Months or More | (6) | (2,500)
Fair Value | 98,869 | 392,219
Unrealized losses | $ (1,127) | $ (5,411)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 1 | 11
Fair Value - Less Than 12 Months | $ 2,441 | $ 30,459
Unrealized Losses - Less Than 12 Months | (78) | (328)
Fair Value - 12 Months of More | 0 | 0
Unrealized Losses - 12 Months or More | 0 | 0
Fair Value | 2,441 | 30,459
Unrealized losses | $ (78) | $ (328)
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 14 | 59
Fair Value - Less Than 12 Months | $ 59,434 | $ 162,964
Unrealized Losses - Less Than 12 Months | (858) | (1,850)
Fair Value - 12 Months of More | 1,004 | 63,633
Unrealized Losses - 12 Months or More | (6) | (755)
Fair Value | 60,438 | 226,597
Unrealized losses | $ (864) | $ (2,605)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 8 | 35
Fair Value - Less Than 12 Months | $ 33,046 | $ 66,549
Unrealized Losses - Less Than 12 Months | (129) | (733)
Fair Value - 12 Months of More | 0 | 68,614
Unrealized Losses - 12 Months or More | 0 | (1,745)
Fair Value | 33,046 | 135,163
Unrealized losses | $ (129) | $ (2,478)
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 3 |
Fair Value - Less Than 12 Months | $ 2,944 |
Unrealized Losses - Less Than 12 Months | (56) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 2,944 |
Unrealized losses | $ (56) |

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