Investments in Qualified Affordable Housing Projects and Historic Projects (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Income tax benefit	$ (25,031)	$ 4,429	$ (6,213)	$ (13,086)	$ (21,375)	$ 11,735	$ (19,314)	$ (21,287)	$ (39,901)	$ (50,241)	$ (86,096)
Remaining unfunded equity contributions	107,400				131,300				107,400	131,300
Qualified Affordable Housing Projects
Schedule of Equity Method Investments [Line Items]
Amortization expense									21,200	13,300	9,900
Tax credits and other benefits									26,300	16,600	$ 11,600
Remaining investment amount	214,300				195,800				214,300	195,800
Federal Historic Projects and Ohio Historical Preservation Projects
Schedule of Equity Method Investments [Line Items]
Remaining investment amount	$ 48,600				$ 43,600				48,600	43,600
Federal Historic Projects
Schedule of Equity Method Investments [Line Items]
Amortization expense									4,400	4,000
Tax credits and other benefits										4,600
Income tax benefit									5,200
Ohio Historical Preservation Projects
Schedule of Equity Method Investments [Line Items]
Amortization expense									$ 875	$ 0