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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Pass-through MBS issued by GSEs |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | $ 177,409 | $ 5,007
12 Consecutive Months or Longer | 0 | 0
Total | 177,409 | 5,007
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 1,945 | 31
12 Consecutive Months or Longer | 0 | 0
Total | 1,945 | 31
Treasury Securities |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 70,963 |
12 Consecutive Months or Longer | 0 |
Total | 70,963 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 100 |
12 Consecutive Months or Longer | 0 |
Total | 100 |
State and municipal obligations |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 7,723 |
12 Consecutive Months or Longer | 0 |
Total | 7,723 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 108 |
12 Consecutive Months or Longer | 0 |
Total | 108 |
Agency Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 81,035 | 22,409
12 Consecutive Months or Longer | 0 | 0
Total | 81,035 | 22,409
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 1,439 | 91
12 Consecutive Months or Longer | 0 | 0
Total | 1,439 | 91
Corporate Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 6,855 |
12 Consecutive Months or Longer | 0 |
Total | 6,855 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 56 |
12 Consecutive Months or Longer | 0 |
Total | 56 |
Agency CMOs [Member] |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 235,036 | 6,563
12 Consecutive Months or Longer | 0 | 4,954
Total | 235,036 | 11,517
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 3,691 | 30
12 Consecutive Months or Longer | 0 | 46
Total | $ 3,691 | $ 76

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