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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 138 | 30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 727,811 | $ 107,635
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9,191 | 916
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 30,128 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (753) | (6)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 757,939 | 108,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 9,944 | $ 922
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 3 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,554 | $ 2,404
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,322 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (196) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 4,876 | 2,404
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 202 | $ 115
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 83 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 528,776 | $ 61,222
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,286 | 568
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 14,565 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (325) | (6)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 543,341 | 62,202
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 6,611 | $ 574
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 44 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 180,559 | $ 39,107
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,664 | 135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13,241 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (232) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 193,800 | 39,107
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,896 | $ 135
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 5 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 8,471 | $ 4,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 101 | 98
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 8,471 | 4,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 101 | $ 98
Obligations of U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 3 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 7,451 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 134 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 7,451 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 134 |

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