Federal and State Income Taxes - Summary of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective income tax rate reconciliation
Federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal income tax benefit	4.80%	4.70%	4.60%
Tax-exempt interest income	(4.40%)	(4.20%)	(4.00%)
Tax credits	(2.80%)	(4.80%)	(4.20%)
Other, net	(0.50%)	1.80%	1.40%
Effective income tax rate	18.10%	18.50%	18.80%