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INVESTMENT AND MORTGAGE-BACKED SECURITIES, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Pass-through MBS issued by GSEs |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | $ 181,917 | $ 5,007
12 Consecutive Months or Longer | 0 | 0
Total | 181,917 | 5,007
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 4,788 | 31
12 Consecutive Months or Longer | 0 | 0
Total | 4,788 | 31
Treasury Securities |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 92,272 |
12 Consecutive Months or Longer | 0 |
Total | 92,272 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 275 |
12 Consecutive Months or Longer | 0 |
Total | 275 |
State and municipal obligations |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 19,004 |
12 Consecutive Months or Longer | 0 |
Total | 19,004 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 288 |
12 Consecutive Months or Longer | 0 |
Total | 288 |
Agency Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 69,570 | 22,409
12 Consecutive Months or Longer | 0 | 0
Total | 69,570 | 22,409
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 2,930 | 91
12 Consecutive Months or Longer | 0 | 0
Total | 2,930 | 91
Corporate Notes [Member] |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 18,278 |
12 Consecutive Months or Longer | 0 | 0
Total | 18,278 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 420 |
12 Consecutive Months or Longer | 0 | 0
Total | 420 |
Agency Collateralized Mortgage Obligations ("CMOs") |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 239,145 | 6,563
12 Consecutive Months or Longer | 0 | 4,954
Total | 239,145 | 11,517
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 6,324 | 30
12 Consecutive Months or Longer | 0 | 46
Total | $ 6,324 | $ 76

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