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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Mar. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | $ 37,760 | $ 259,972
Unrealized Losses - Less Than 12 Months | (458) | (2,911)
Fair Value - 12 Months of More | 1,638 | 132,247
Unrealized Losses - 12 Months or More | (43) | (2,500)
Fair Value | 39,398 | 392,219
Unrealized losses | $ (501) | $ (5,411)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 406 | 105
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | $ 20,029 | $ 30,459
Unrealized Losses - Less Than 12 Months | (337) | (328)
Fair Value - 12 Months of More | 0 | 0
Unrealized Losses - 12 Months or More | 0 | 0
Fair Value | 20,029 | 30,459
Unrealized losses | $ (337) | $ (328)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 168 | 11
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 | $ 7,626 | $ 162,964
Unrealized Losses - Less Than 12 Months | (34) | (1,850)
Fair Value - 12 Months of More | 1,638 | 63,633
Unrealized Losses - 12 Months or More | (43) | (755)
Fair Value | 9,264 | 226,597
Unrealized losses | $ (77) | $ (2,605)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 144 | 59
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 | $ 5,180 | $ 66,549
Unrealized Losses - Less Than 12 Months | (12) | (733)
Fair Value - 12 Months of More | 0 | 68,614
Unrealized Losses - 12 Months or More | 0 | (1,745)
Fair Value | 5,180 | 135,163
Unrealized losses | $ (12) | $ (2,478)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 86 | 35
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value - Less Than 12 Months | $ 4,925 |
Unrealized Losses - Less Than 12 Months | (75) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 4,925 |
Unrealized losses | $ (75) |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 8 |

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