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INVESTMENT AND MORTGAGE-BACKED SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Pass-through MBS issued by GSEs |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | $ 446,864 | $ 5,007
12 Consecutive Months or Longer | 0 | 0
Total | 446,864 | 5,007
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 6,273 | 31
12 Consecutive Months or Longer | 0 | 0
Total | 6,273 | 31
Treasury Securities |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 231,984 |
12 Consecutive Months or Longer | 0 |
Total | 231,984 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 482 |
12 Consecutive Months or Longer | 0 |
Total | 482 |
State and municipal obligations |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 16,412 |
12 Consecutive Months or Longer | 0 |
Total | 16,412 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 178 |
12 Consecutive Months or Longer | 0 |
Total | 178 |
Agency Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 81,018 | 22,409
12 Consecutive Months or Longer | 0 | 0
Total | 81,018 | 22,409
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 1,457 | 91
12 Consecutive Months or Longer | 0 | 0
Total | 1,457 | 91
Corporate Notes |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 17,863 |
12 Consecutive Months or Longer | 0 |
Total | 17,863 |
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 401 |
12 Consecutive Months or Longer | 0 |
Total | 401 |
Agency Collateralized Mortgage Obligations ("CMOs") |  |
Securities available-for-sale, Fair Value [Abstract] |  |
Less than 12 Consecutive Months | 347,726 | 6,563
12 Consecutive Months or Longer | 0 | 4,954
Total | 347,726 | 11,517
Securities available-for-sale, Unrealized Losses [Abstract] |  |
Less than 12 Consecutive Months | 5,118 | 30
12 Consecutive Months or Longer | 0 | 46
Total | $ 5,118 | $ 76

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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