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Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Details) - Asset-backed securities issued $ in Thousands | Dec. 31, 2019 USD ($) series | Dec. 31, 2018 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Market valuation adjustments | $ 197,110 | $ (58,290)
Total FHLBC Borrowings | 10,515,475 | 5,410,073
Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 9,962,253 | 5,309,564
Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 356,112 | 158,799
Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | (18,873) | (29,753)
Total FHLBC Borrowings | $ 402,465 | $ 512,240
Number of series | series | 20 | 20
Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 1.94% | 1.36%
Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.26% | 3.60%
Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 420,056 | $ 540,456
Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 1,282 | 1,537
Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 40,965 | 20,590
Total FHLBC Borrowings | $ 2,037,198 | $ 1,885,010
Number of series | series | 9 | 6
Sequoia Choice | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 4.40% | 4.46%
Sequoia Choice | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.05% | 4.97%
Sequoia Choice | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,979,719 | $ 1,838,758
Sequoia Choice | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 16,514 | 25,662
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 45,349 | 89
Total FHLBC Borrowings | $ 1,918,322 | $ 993,748
Range of weighted average interest rates, by series | 3.50% | 3.51%
Number of series | series | 2 | 1
Freddie Mac SLST | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,842,682 | $ 993,659
Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 30,291 | 0
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 93,559 | (49,216)
Total FHLBC Borrowings | $ 4,156,239 | $ 2,019,075
Number of series | series | 5 | 3
Freddie Mac K-Series | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.35% | 3.39%
Freddie Mac K-Series | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 4.35% | 4.08%
Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 3,844,789 | $ 1,936,691
Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 217,891 | 131,600
CAFL |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 36,110 | 0
Total FHLBC Borrowings | $ 2,001,251 | $ 0
Number of series | series | 10 | 0
CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.25% |
CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.36% |
CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,875,007 | $ 0
CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 90,134 | $ 0

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