Income Taxes (Schedule Of Income Tax Expenses And Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Computed tax expense at statutory rate									$ 15,224	$ 25,154	$ 13,734
Tax effect of federal rate change											17,293
State taxes									4,140	6,148	1,199
Tax-exempt interest income									(467)	(408)	(1,600)
Meals and entertainment									97	80	63
Civil money penalty									1,870
Other nondeductible items									263	546	2,421
Valuation allowance - domestic										721	(9,813)
Other									99		(241)
Income Tax Expense (Benefit), Total	$ 3,641	$ 7,975	$ 3,575	$ 6,035	$ 2,691	$ 21,942	$ 2,209	$ 5,399	$ 21,226	$ 32,241	$ 23,056