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SECURITIES (Securities with Continuous Loss Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 945,802 | $ 189,078
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (36,138) | (1,135)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 554,399 | 58,616
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (17,122) | (1,004)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,500,201 | 247,694
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | 53,260 | 2,139
U.S. Government and agency obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,090 | 3,126
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (10) | (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 43,952 | 50,603
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (806) | (927)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 47,042 | 53,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | 816 | 935
Municipal bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 50,710 | 495
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,232) | (2)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 8,403 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (96) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 59,113 | 495
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | 1,328 | 2
Corporate bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 24,406 | 3,586
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (286) | (79)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 996 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 25,402 | 3,586
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | 290 | 79
Mortgage-backed or related securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 863,848 | 181,871
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (34,608) | (1,046)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 501,048 | 2,337
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (16,216) | (14)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1,364,896 | 184,208
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | 50,824 | 1,060
Asset-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,748 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 5,676
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | (63)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,748 | 5,676
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss, Total | $ 2 | $ 63

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