• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Investments (Trading Securities) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost and Fair Value Debt Securities [Abstract]    
Trading securities cost $ 953 $ 0
Trading securities net unrealized gains 92  
Trading securities estimated fair value $ 1,045 $ 0