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Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subordinated notes
Federal tax credits recognized in tax expense	$ 2,020	$ 1,720	$ 1,550
Investment tax credits	3,530	31,080	$ 15,860
Investment carrying amount	8,096,289	7,316,411
Unfunded capital and other commitments	7,126,825	6,385,741
Unconsolidated maximum exposure to loss	50,319	52,106
Variable interest entity, primary beneficiary
Subordinated notes
Investment carrying amount	59,080	53,610
Unfunded capital and other commitments	0	4,930
Variable interest entity, not primary beneficiary
Subordinated notes
Investment carrying amount	35,968	22,742
Unfunded capital and other commitments	$ 29,670	$ 26,716

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