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Deferred Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Postemployment Benefits [Abstract]  
Summary of Changes in Deferred Compensation Plan Liability
A summary of changes in the deferred compensation plan liability follows:
 
2018
 
2017
 
2016
Balance, beginning of year
$
2,503

 
$
2,080

 
$
1,226

Deferrals, dividends, and changes in fair value recorded as an expense
64

 
444

 
936

Deferred compensation payments
(159
)
 
(21
)
 
(82
)
Balance, end of year
$
2,408

 
$
2,503

 
$
2,080