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Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Nov. 20, 2018
Officer
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
May 02, 2016
shares
Stock-Based Compensation [Abstract]            
Number of retiring officers receiving accelerated vesting period | Officer 1          
LTIP [Member]            
Stock-Based Compensation [Abstract]            
Maximum number of shares of common stock that can be issued under the plan (in shares)           100,000
Term of plan       10 years    
Maximum number of shares of common stock subject to awards that may be granted to a participant per calendar year (in shares)       2,000    
LTIP [Member] | Restricted Stock [Member]            
Number of Shares [Roll Forward]            
Nonvested at beginning of the period (in shares)       3,080    
Granted (in shares)       6,963    
Vested (in shares)       (2,556)    
Forfeited (in shares)       0    
Nonvested at end of the period (in shares)   7,487   7,487    
Grant Date Weighted Average Fair Value [Abstract]            
Nonvested at beginning of the period (in dollars per share) | $ / shares       $ 33.85    
Granted (in dollars per share) | $ / shares       33.61    
Vested (in dollars per share) | $ / shares       33.80    
Forfeited (in dollars per share) | $ / shares       0    
Nonvested at end of the period (in dollars per share) | $ / shares   $ 33.64   $ 33.64    
Stock-Based Compensation Expense [Abstract]            
Stock-based compensation expense | $   $ 65 $ 53 $ 79 $ 57  
Recognized tax benefits related to stock-based compensation expense | $   19 $ 15 23 $ 16  
Fair value of vested shares | $       86    
Stock-based compensation expense not yet recognized | $   $ 252   $ 252    
Period of recognition       3 years    
LTIP [Member] | Restricted Stock [Member] | Officers and Key Employees [Member]            
Stock-Based Compensation [Abstract]            
Vesting period       3 years