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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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