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Stock-Based Compensation and Stock Awards - Director Stock Compensation Awards - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Anti-dilutive awards (in shares)   21,483 186,112  
DSA        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fees in lieu of cash (equal to) (as a percentage) 125.00%      
Director stock compensation awards expense   $ 463,000 $ 405,000 $ 328,000
Income tax benefit recognized   115,002 $ 19,000 $ 41,000
Unrecognized compensation expense related to share based compensation   $ 302,000    
Period of recognition for unrecognized compensation expense related to nonvested stock options (in years)   1 year    
Anti-dilutive awards (in shares)   7,703