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Investments - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Investment grade rating	80.80%
Limited partnership interests	$ 418,187	$ 383,717
Debt securities, available-for-sale	6,168,558	5,791,676
FHLB funding agreements	644,500	545,000
FHLB of Chicago
Investment Holdings [Line Items]
Debt securities, available-for-sale	697,100	594,200
Governmental Agencies as Required by Law in Various States
Investment Holdings [Line Items]
Debt securities, available-for-sale	$ 26,900	$ 26,000

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of investment in equity method investee and investment in and advance to affiliate.

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