Income Taxes (Reconciliation Income Tax Expense And Statutory Income Tax Rates) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount
Computed tax at applicable statutory rate		$ 7,553	$ 8,857	$ 8,048
Tax-exempt interest and dividends, net		(1,569)	(1,080)	(1,047)
State income taxes, net of Federal income tax benefit		354	405	331
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		0	108	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount		(247)	(55)	0
Other, net		112	(227)	(439)
Applicable income taxes		$ 9,664	$ 8,008	$ 6,893
Percent
Computed tax at applicable statutory rate	35.00%	35.00%	35.00%	35.00%
Tax-exempt interest and dividends, net		(7.00%)	(4.00%)	(4.00%)
State income taxes, net of Federal income tax benefit		2.00%	2.00%	1.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent		0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent		(1.00%)	0.00%	0.00%
Other, net		0.00%	(1.00%)	(2.00%)
Applicable income taxes		45.00%	32.00%	30.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 3,461	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent		16.00%	0.00%	0.00%