XML 105 R87.htm IDEA: XBRL DOCUMENT v3.8.0.1
Directors Retirement Plan - Benefits Expected to be Paid (Detail) - Director
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 75
2019 63
2020 63
2021 37
2022 37
2023 - 2027 $ 240