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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Jun. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 103 | 30
Fair Value - Less Than 12 Months | $ 550,272 | $ 107,635
Unrealized Losses - Less Than 12 Months | (7,162) | (916)
Fair Value - 12 Months of More | 6,625 | 980
Unrealized Losses - 12 Months or More | (314) | (6)
Fair Value | 556,897 | 108,615
Unrealized losses | $ (7,476) | $ (922)
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 | 2 | 1
Fair Value - Less Than 12 Months | $ 1,294 | $ 2,404
Unrealized Losses - Less Than 12 Months | (2) | (115)
Fair Value - 12 Months of More | 2,265 | 0
Unrealized Losses - 12 Months or More | (253) | 0
Fair Value | 3,559 | 2,404
Unrealized losses | $ (255) | $ (115)
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 | 54 | 15
Fair Value - Less Than 12 Months | $ 329,607 | $ 61,222
Unrealized Losses - Less Than 12 Months | (3,358) | (568)
Fair Value - 12 Months of More | 297 | 980
Unrealized Losses - 12 Months or More | (2) | (6)
Fair Value | 329,904 | 62,202
Unrealized losses | $ (3,360) | $ (574)
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 | 42 | 9
Fair Value - Less Than 12 Months | $ 211,308 | $ 39,107
Unrealized Losses - Less Than 12 Months | (3,665) | (135)
Fair Value - 12 Months of More | 4,063 | 0
Unrealized Losses - 12 Months or More | (59) | 0
Fair Value | 215,371 | 39,107
Unrealized losses | $ (3,724) | $ (135)
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Holdings | security | 2 | 5
Fair Value - Less Than 12 Months | $ 1,982 | $ 4,902
Unrealized Losses - Less Than 12 Months | (18) | (98)
Fair Value - 12 Months of More | 0 | 0
Unrealized Losses - 12 Months or More | 0 | 0
Fair Value | 1,982 | 4,902
Unrealized losses | $ (18) | $ (98)
Obligations of U.S. government sponsored enterprises |  |
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 | $ 6,081 |
Unrealized Losses - Less Than 12 Months | (119) |
Fair Value - 12 Months of More | 0 |
Unrealized Losses - 12 Months or More | 0 |
Fair Value | 6,081 |
Unrealized losses | $ (119) |

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