Variable Interest Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Subordinated Borrowing [Line Items]
Federal tax credits recognized in tax expense	$ 660	$ 500
Investment tax credits	17,490	$ 0
Investment carrying amount	8,329,803		$ 8,339,416
Unfunded capital and other commitments	7,361,359		7,415,650
Maximum exposure to loss, unconsolidated VIEs	45,302		45,020
Variable interest entity, primary beneficiary
Subordinated Borrowing [Line Items]
Investment carrying amount	65,790		66,260
Unfunded capital and other commitments	0		0
Variable interest entity, not primary beneficiary
Subordinated Borrowing [Line Items]
Investment carrying amount	53,691		70,887
Unfunded capital and other commitments	$ 62,097		$ 64,520