Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)	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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected income tax expense at federal tax rate													$ 4,397,000	$ 3,234,000	$ 5,728,000
State taxes net of federal benefit													1,745,000	1,281,000	1,096,000
Nondeductible expenses													103,000	85,000	255,000
Nontaxable income													(277,000)	(248,000)	(376,000)
Provisional deferred tax adjustment related to reduction in U.S. federal statutory income tax rate													0	0	2,740,000
Other													(303,000)	(179,000)	(286,000)
Income tax expense	$ 1,558,000	$ 1,397,000	$ 1,394,000	$ 1,316,000	$ 1,371,000	$ 1,441,000	$ 828,000	$ 533,000	$ 4,456,000	$ 1,717,000	$ 1,536,000	$ 1,448,000	$ 5,665,000	$ 4,173,000	$ 9,157,000
Expected income tax expense at federal tax rate (as a percent of pre-tax income)													21.00%	21.00%	35.00%
State taxes net of federal benefit (as a percent of pre-tax income)													8.33%	8.32%	6.70%
Nondeductible expenses (as a percent of pre-tax income)													0.49%	0.55%	1.56%
Nontaxable income (as a percent of pre-tax income)													(1.31%)	(1.61%)	(2.30%)
Provisional deferred tax adjustment related to reduction in U.S. federal statutory income tax rate (as a percent of pre-tax income)													0.00%	0.00%	16.74%
Other (as a percent of pre-tax income)													(1.45%)	(1.16%)	(1.75%)
Total income tax expense (as a percent of pre-tax income)													27.06%	27.10%	55.95%