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Long-Term Debt - Debt maturities (Details) - FHLB Subsidiary - FHLB Chicago $ in Thousands	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
2024	$ 470,171
2025	887,639
2026	642,189
Total FHLBC Borrowings	$ 1,999,999

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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