Income Taxes (Schedule of Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Tax Expense:
Federal									$ 19,248	$ 17,298	$ 15,460
State									3,213	3,254	2,863
Total current tax expense									22,461	20,552	18,323
Deferred Tax (Benefit) Expense:
Federal									(2,375)	(1,294)	63
State									(755)	(197)	(126)
Total deferred tax (benefit) expense									(3,130)	(1,491)	(63)
Income tax expense	$ 5,514	$ 5,131	$ 5,547	$ 3,139	$ 4,321	$ 5,236	$ 4,662	$ 4,842	$ 19,331	$ 19,061	$ 18,260