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Employee Benefit Plans - Additional Information (Detail)
6 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Jun. 23, 2015
shares
May 31, 2014
shares
Dec. 31, 2013
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized 40,000,000 40,000,000 40,000,000        
Treasury stock, shares 1,434,389 1,457,200 1,434,389        
Number of active plans | plan   2          
Share-based compensation expense | $   $ 2,402,000 $ 1,414,000 $ 930,000      
Granted (in shares)     0 0      
Options outstanding (in shares) 0 0 0 4,000     10,000
Options, outstanding, intrinsic value | $ $ 0   $ 0        
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of nonvested shares (in shares) 437,946 527,486 437,946 413,288     371,502
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 7.09 $ 10.17 $ 7.09 $ 5.09     $ 4.34
Options, vested in period, fair value | $   $ 0 $ 157,000 $ 227,000      
Unrecognized compensation costs, other than options | $   $ 1,879,000          
Period for recognition of unrecognized compensation cost   1 year 8 months          
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of nonvested shares (in shares) 128,500 0 128,500 278,900     569,296
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 5.85 $ 0.00 $ 5.85 $ 6.28     $ 5.26
Options, vested in period, fair value | $   $ 752,000 $ 1,038,000 $ 552,000      
Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation costs, options | $   0          
Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense | $   $ 317,000 482,000 0      
Award vesting period   48 months          
Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares registered for employee purchase           300,000  
The 2014 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock authorized but not granted (in shares)   1,500,000          
Granted (in shares)   236,069          
The 2014 Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period   3 years          
The Director's Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock authorized but not granted (in shares)   300,000          
Grants in period (in shares)   54,248          
The 2004 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period   5 years          
Restricted stock authorized but not granted (in shares)   2,680,000          
Weighted average remaining contractual term   10 years          
The 2004 Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for grant   0          
Authorized shares remaining for issuance   331,000          
The 2004 Plan [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of nonvested shares (in shares)   0          
Number of shares available for grant   0          
The 2004 Plan [Member] | Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options outstanding (in shares)   0          
Directors Stock Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock authorized but not granted (in shares)   175,000          
Number of shares available for grant   0          
Annual Cash Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Targeted bonus award expense | $   $ 3,394,000 $ 4,964,000 $ 3,166,000      
Vice President [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of nonvested shares (in shares)         29,941    
Vice President [Member] | Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of nonvested shares (in shares)         16,500    
Accelerated compensation cost | $ $ 195,000            
Period to Grant Date [Member] | Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period   12 months          
Remaining Award Vesting Period [Member] | Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period   36 months