Annual report pursuant to Section 13 and 15(d)

Deferred Compensation Plan (Details)

v3.8.0.1
Deferred Compensation Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Plans Disclosure [Abstract]    
Minimum period of participation before distributions are made 5 years  
Cash surrender value due policyholders, amount $ 12,711 $ 10,210
Deferred compensation liability $ 18,161 $ 17,247