Income Taxes - Reasons for Income Tax Provision Differences to Statutory Rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	21.00%	21.00%	21.00%
Changes in taxes resulting from :
State taxes, net of federal benefit	2.40%	1.80%	2.10%
Low income housing tax credits	(1.40%)	(2.00%)	(4.30%)
Incentive compensation	(1.30%)	(1.60%)	(1.40%)
Dividend received deduction	(1.10%)	(1.00%)	(2.10%)
Other, net	0.00%	(0.60%)	0.90%
Income tax provision	19.60%	17.60%	16.20%