Provisions for Federal and State Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Income Tax Provision
Federal	$ 250
State	678	$ 351	$ 355
Total Current Income Taxes	928	351	355
Deferred Income Provision
Federal	6,483	9,340	5,032
State	2,838	4,117	3,006
Total Deferred Income Taxes	9,321	13,457	8,038
Total Income Tax Expense	$ 10,249	$ 13,808	$ 8,393