Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.50%)	(0.50%)	(0.80%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(3.80%)	(3.60%)	(3.40%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.40%	1.30%	1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.80%	0.10%	0.20%
Effective Income Tax Rate Reconciliation, Percent	18.90%	18.30%	18.10%