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v3.20.1

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 | Mar. 31, 2020 USD ($) series | Dec. 31, 2019 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Market valuation adjustments | $ (217,932) | $ 197,110
Total FHLBC Borrowings | 6,461,864 | 10,515,475
Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 6,534,612 | 9,962,253
Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 145,184 | 356,112
Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | (87,507) | (18,873)
Total FHLBC Borrowings | $ 312,201 | $ 402,465
Number of series | series | 20 | 20
Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 1.81% | 1.94%
Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.91% | 3.26%
Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 398,352 | $ 420,056
Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 1,356 | 1,282
Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 2,836 | 40,965
Total FHLBC Borrowings | $ 1,790,094 | $ 2,037,198
Number of series | series | 9 | 9
Sequoia Choice | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 4.37% | 4.40%
Sequoia Choice | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.04% | 5.05%
Sequoia Choice | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,776,396 | $ 1,979,719
Sequoia Choice | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 10,862 | 16,514
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 0 | 45,349
Total FHLBC Borrowings | $ 1,825,000 | $ 1,918,322
Range of weighted average interest rates, by series | 3.50% | 3.50%
Number of series | series | 2 | 2
Freddie Mac SLST | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,800,218 | $ 1,842,682
Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 24,782 | 30,291
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | 15,104 | 93,559
Total FHLBC Borrowings | $ 447,699 | $ 4,156,239
Range of weighted average interest rates, by series | 3.53% |
Number of series | series | 1 | 5
Freddie Mac K-Series | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series |  | 3.35%
Freddie Mac K-Series | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series |  | 4.35%
Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 418,212 | $ 3,844,789
Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 14,383 | 217,891
CAFL |  |
Debt Instrument [Line Items] |  |
Market valuation adjustments | (148,365) | 36,110
Total FHLBC Borrowings | $ 2,086,870 | $ 2,001,251
Number of series | series | 11 | 10
CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.22% | 3.25%
CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.22% | 5.36%
CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 2,141,434 | $ 1,875,007
CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | $ 93,801 | $ 90,134

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