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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Tax at statutory rates	35.00%	35.00%	34.00%
Tax exempt interest income, net of interest expense disallowance	(9.60%)	(13.10%)	(11.30%)
Nondeductible merger expenses		2.70%
Incentive stock options	0.20%	0.30%	0.30%
Earnings and proceeds on life insurance	(2.70%)	(2.80%)	(1.80%)
Change in corporate tax rate	20.80%
Other	0.70%	(0.20%)	0.40%
Effective Income Tax Rate, Continuing Operations, Total	44.40%	21.90%	21.60%

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Effective Income Tax Reconciliation, Nondeductible Expense, Merger Expenses

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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