Income Taxes - Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax at U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	3.10%	3.50%	3.10%
Non-deductible expenses	0.40%	3.20%	1.60%
Affordable housing, new markets and other tax credits	(2.30%)	(11.40%)	(5.20%)
Tax-exempt interest and other nontaxable income	(0.30%)	(1.70%)	(0.80%)
Changes in valuation allowance	0.40%	2.30%	(0.30%)
Other, net	(0.70%)	(1.70%)	0.10%
Effective income tax rate	21.60%	15.20%	19.50%