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Income Taxes (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards $ 22,000    
Income tax expense (benefit), intraperiod tax allocation 12,657 $ 8,983 $ 9,887
Reduction in net deferred tax liability 426    
Deferred tax liabilities $ 208 $ 779  
Effective tax rate, Statutory federal tax 35.00% 35.00% 35.00%
Estimated Tax Act impact on earnings per common share $ 0.04    
Scenario, Plan [Member]      
Tax Credit Carryforward [Line Items]      
Effective tax rate, Statutory federal tax 21.00%    
Maryland State [Member]      
Tax Credit Carryforward [Line Items]      
Operating loss carryforwards expiration year 2029