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SECURITIES (Securities with Continuous Loss Position) (Details) $ in Thousands | Mar. 31, 2022 USD ($) numberOfSecurities | Dec. 31, 2021 USD ($) numberOfSecurities
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,806,218 | $ 1,359,199
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 660,540 | 811,239
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,466,758 | 2,170,438
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 107,337 | 38,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 66,468 | 12,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 173,805 | $ 51,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities | 219 | 97
U.S. Government and agency obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 101,620 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 26,851 | 71,306
Debt Securities, Available-for-sale, Unrealized Loss Position | 128,471 | 71,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 182 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 574 | 621
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 756 | 621
Municipal bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 159,886 | 40,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 8,541
Debt Securities, Available-for-sale, Unrealized Loss Position | 159,886 | 48,938
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16,238 | 221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 99
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 16,238 | 320
Corporate bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 83,374 | 8,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 9,938
Debt Securities, Available-for-sale, Unrealized Loss Position | 83,374 | 17,947
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,196 | 121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 62
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,196 | 183
Mortgage-backed or related securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,352,151 | 1,307,411
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 633,689 | 721,454
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,985,840 | 2,028,865
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 88,005 | 38,028
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 65,894 | 11,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 153,899 | 49,961
Asset-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 109,187 | 3,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 109,187 | 3,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 716 | 9
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, Accumulated Loss | $ 716 | $ 9

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