Federal and State Income Taxes - Summary of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective income tax rate reconciliation
Federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal income tax benefit	4.90%	4.80%	4.70%
Tax-exempt interest income	(4.30%)	(4.40%)	(4.20%)
Tax credits	(5.60%)	(2.80%)	(4.80%)
Other, net	0.70%	(0.50%)	1.80%
Effective income tax rate	16.70%	18.10%	18.50%