Organization and Nature of Operations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 07, 2018	Dec. 31, 2017
Organization And Nature Of Operations [Line Items]
Entity incorporation, date of incorporation		Apr. 03, 2006
MHC [Member]
Organization And Nature Of Operations [Line Items]
Equity method investment, ownership percentage		59.60%
Cumulative cash dividend waived		$ 9.4
Equity securities common stock shares owned		3,636,875
MHC [Member] | Subsequent Event [Member]
Organization And Nature Of Operations [Line Items]
Equity method investment, ownership percentage	59.80%
Equity securities common stock shares owned	3,636,875
Dividends Waived [Member] | MHC [Member] | Subsequent Event [Member]
Organization And Nature Of Operations [Line Items]
Aggregate annual dividend per share	$ 0.40