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INVESTMENT AND MORTGAGE-BACKED SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available-for-sale, Fair Value [Abstract] |  |
Total | $ 0 |
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 422,634,000 | $ 5,007,000
12 Consecutive Months or Longer | 4,748,000 |
Total | 427,382,000 | 5,007,000
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 6,333,000 | 31,000
12 Consecutive Months or Longer | 233,000 |
Total | 6,566,000 | 31,000
Securities held-to-maturity, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 97,328,000 |
Total | 97,328,000 |
Securities held-to-maturity, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 1,141,000 |
Total | 1,141,000 |
Treasury Securities |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 244,769,000 |
Total | 244,769,000 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 3,147,000 |
Total | 3,147,000 |
State and municipal obligations |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 18,887,000 |
Total | 18,887,000 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 302,000 |
Total | 302,000 |
Agency Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 58,607,000 | 22,409,000
12 Consecutive Months or Longer | 21,647,000 |
Total | 80,254,000 | 22,409,000
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 1,369,000 | 91,000
12 Consecutive Months or Longer | 853,000 |
Total | 2,222,000 | 91,000
Corporate Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 37,620,000 |
Total | 37,620,000 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 754,000 |
Total | 754,000 |
Agency collateralized mortgage obligations ("CMOs") |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 349,879,000 | 6,563,000
12 Consecutive Months or Longer | 3,182,000 | 4,954,000
Total | 353,061,000 | 11,517,000
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 8,672,000 | 30,000
12 Consecutive Months or Longer | 123,000 | 46,000
Total | 8,795,000 | $ 76,000
Securities held-to-maturity, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 60,054,000 |
Total | 60,054,000 |
Securities held-to-maturity, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 873,000 |
Total | $ 873,000 |

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