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INVESTMENT AND MORTGAGE-BACKED SECURITIES - Securities Available-for-sale Major Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 1,706,892 | $ 520,261
Gross Unrealized Gains | 16,080 | 18,798
Gross Unrealized Losses | (13,909) | (198)
Fair Value | 1,709,063 | 538,861
Agency Notes |  |
Securities available-for-sale: |  |
Amortized Cost | 82,475 | 47,500
Gross Unrealized Gains |  | 12
Gross Unrealized Losses | (1,457) | (91)
Fair Value | 81,018 | 47,421
Treasury Securities |  |
Securities available-for-sale: |  |
Amortized Cost | 248,173 |
Gross Unrealized Gains | 5 |
Gross Unrealized Losses | (482) |
Fair Value | 247,696 |
Corporate Securities |  |
Securities available-for-sale: |  |
Amortized Cost | 122,476 | 62,021
Gross Unrealized Gains | 4,758 | 2,440
Gross Unrealized Losses | (401) |
Fair Value | 126,833 | 64,461
Pass-through MBS issued by GSEs |  |
Securities available-for-sale: |  |
Amortized Cost | 622,225 | 135,842
Gross Unrealized Gains | 6,005 | 7,672
Gross Unrealized Losses | (6,273) | (31)
Fair Value | 621,957 | 143,483
Agency Collateralized Mortgage Obligations ("CMOs") |  |
Securities available-for-sale: |  |
Amortized Cost | 590,385 | 274,898
Gross Unrealized Gains | 5,159 | 8,674
Gross Unrealized Losses | (5,118) | (76)
Fair Value | 590,426 | $ 283,496
State and municipal obligations. |  |
Securities available-for-sale: |  |
Amortized Cost | 41,158 |
Gross Unrealized Gains | 153 |
Gross Unrealized Losses | (178) |
Fair Value | $ 41,133 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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