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SECURITIES - Summary of Residential Securities and CMBS (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | $ 92,623,788
Purchases | 23,747,904
Sales | (10,496,300)
Principal paydowns | (2,386,119)
Amortization / accretion | (247,369)
Fair value adjustment | 1,751,367
Ending balance | 104,993,271
Residential Securities |
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | 92,467,030
Purchases | 23,649,271
Sales | (10,456,466)
Principal paydowns | (2,343,260)
Amortization / accretion | (247,447)
Fair value adjustment | 1,748,912
Ending balance | 104,818,040
Commercial Securities |
Debt Securities, Available-For-Sale [Line Items] |
Beginning balance | 156,758
Purchases | 98,633
Sales | (39,834)
Principal paydowns | (42,859)
Amortization / accretion | 78
Fair value adjustment | 2,455
Ending balance | $ 175,231

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