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SECURITIES - Summary of Residential Securities and CMBS (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | $ 92,623,788
Purchases | 50,123,242
Sales | (19,641,265)
Principal paydowns | (6,105,818)
(Amortization) / accretion | (565,722)
Fair value adjustment | 3,492,644
Ending balance | 119,926,869
Residential Securities |
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | 92,467,030
Purchases | 50,015,524
Sales | (19,548,899)
Principal paydowns | (6,062,713)
(Amortization) / accretion | (566,071)
Fair value adjustment | 3,486,890
Ending balance | 119,791,761
Commercial Securities |
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | 156,758
Purchases | 107,718
Sales | (92,366)
Principal paydowns | (43,105)
(Amortization) / accretion | 349
Fair value adjustment | 5,754
Ending balance | $ 135,108

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