Income Taxes (Summary of Tax Provision Allocation to Financial Statement Items) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Income from operations	$ 14,447	$ 14,759	$ 12,605
Stockholders' equity, unrealized gain (loss) on investment securities & foreign currency	75	43	52
Total Income Tax Expense	$ 14,522	$ 14,802	$ 12,657