Recent Accounting Pronouncements (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement in accounting principle, effect of adoption quantification	$ 35
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained	992
Cumulative adjustment for fair value of equity securities	201
Accumulated Other Comprehensive Loss [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained	(992)
Cumulative adjustment for fair value of equity securities	$ (201)