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Employee Benefit Plans - Additional Information (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
plan
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
shares
May 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, shares authorized 40,000,000 40,000,000      
Treasury stock, shares 1,318,545 1,457,200      
Number of active plans | plan 2        
Share-based compensation expense | $ $ 2,245,000 $ 2,402,000 $ 1,414,000    
Stock shares repurchased (in shares) 74,132 40,870 60,135    
Stock shares repurchased | $ $ 4,663,000 $ 1,518,000 $ 920,000    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares) 47,514 100,892 89,702    
Number of nonvested shares 368,492 527,486 437,946 413,288  
Options, vested in period, fair value | $ $ 979,000 $ 0 $ 157,000    
Unrecognized compensation costs, other than options | $ $ 3,036,000        
Period for recognition of unrecognized compensation cost 1 year 6 months        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs, options | $   $ 0      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)   0 13,585    
Number of nonvested shares 0 0 128,500 278,900  
Options, vested in period, fair value | $   $ 752,000 $ 1,038,000    
Short-term Incentive Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense | $ $ 491,000 317,000 482,000    
Award vesting period 48 months        
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 12 months        
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 36 months        
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares registered for employee purchase         300,000
The 2014 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock authorized but not granted 1,500,000        
Granted (in shares) 280,075        
The 2014 Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
The Director's Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock authorized but not granted 300,000        
Grants in period (in shares) 64,035        
The 2004 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 5 years        
Restricted stock authorized but not granted 2,680,000        
Weighted average remaining contractual term 10 years        
The 2004 Plan | Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant 0        
Authorized shares remaining for issuance 145,000        
The 2004 Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding (in shares) 0        
The 2004 Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of nonvested shares 0        
Number of shares available for grant 0        
Annual Cash Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Targeted bonus award expense | $ $ 5,150,000 $ 3,394,000 $ 4,964,000