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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 335 | 180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 654,758 | $ 871,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 61,494 | 14,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 106,551 | 101,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (15,174) | (3,656)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 761,309 | 972,657
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 76,668 | $ 17,730
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 | 78 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 39,703 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 320 |
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 | 39,703 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 320 |
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 | 170 | 113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 500,257 | $ 659,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 53,944 | 8,999
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 70,192 | 61,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (11,700) | (2,469)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 570,449 | 721,829
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 65,644 | $ 11,468
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 | 76 | 56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 99,345 | $ 191,456
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,562 | 4,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 34,506 | 38,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,328) | (1,165)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 133,851 | 229,573
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 8,890 | $ 5,767
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 11 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 15,453 | $ 11,932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,668 | 232
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,853 | 979
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (146) | (22)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 17,306 | 12,911
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,814 | $ 254
US Government-sponsored Enterprises Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security |  | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | $ 8,344
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 241
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 |  | 8,344
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ 241

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