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SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Unrealized Loss Position For: |  |
Estimated Fair Value | $ 69,238,185 | $ 65,789,907
Gross Unrealized Losses | (3,462,620) | (4,963,091)
Agency Mortgage-Backed Securities |  |
Unrealized Loss Position For: |  |
Estimated Fair Value | 30,658,507 | 34,321,645
Gross Unrealized Losses | $ (2,557,998) | $ (3,714,806)
Number of Securities | security | 2,480 | 2,610
Agency Mortgage-Backed Securities | Less than 12 months |  |
Unrealized Loss Position For: |  |
Estimated Fair Value | $ 12,762,176 | $ 33,061,267
Gross Unrealized Losses | $ (662,612) | $ (3,448,120)
Number of Securities | security | 1,057 | 2,481
Agency Mortgage-Backed Securities | 12 Months or more |  |
Unrealized Loss Position For: |  |
Estimated Fair Value | $ 17,896,331 | $ 1,260,378
Gross Unrealized Losses | $ (1,895,386) | $ (266,686)
Number of Securities | security | 1,423 | 129

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- Definition Mortgage-Backed Securities in a continuous unrealized loss position [Line Items] + References No definition available. + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount excluding accrued interest, of 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, 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 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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