Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2015
Variable Interest Entity [Line Items]
Original benefit of contribution by tax credit investors	$ (4,721)	$ (4,882)
Liabilities	4,038,330	2,337,665
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Liabilities	$ 4,700	$ 4,900
Cloverleaf
Variable Interest Entity [Line Items]
Original benefit of contribution by tax credit investors			$ 5,600