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INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Sep. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 362 | 180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 346,711 | $ 871,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34,549 | 14,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 372,004 | 101,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (75,787) | (3,656)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 718,715 | 972,657
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 110,336 | $ 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 | 101 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 51,026 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,774 |
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 | 51,026 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,774 |
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 | 172 | 113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 203,082 | $ 659,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 24,432 | 8,999
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 322,251 | 61,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (68,505) | (2,469)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 525,333 | 721,829
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 92,937 | $ 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 | $ 83,532 | $ 191,456
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,433 | 4,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 38,279 | 38,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,628) | (1,165)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 121,811 | 229,573
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 13,061 | $ 5,767
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 13 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 9,071 | $ 11,932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 910 | 232
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11,474 | 979
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,654) | (22)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 20,545 | 12,911
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,564 | $ 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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