Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Effective income tax rate	21.50%	22.00%	22.40%	21.50%
Valuation allowance	$ 0		$ 0
Testing period			5 years
AMT credit carryovers	1,400,000		$ 1,400,000
Unrecognized tax benefits	0		0
Federal
Income Taxes [Line Items]
Operating loss carryforwards	0		0
Unused built-in losses	44,900,000		44,900,000
State
Income Taxes [Line Items]
Operating loss carryforwards	46,400,000		46,400,000
Unused built-in losses	$ 7,500,000		$ 7,500,000