Investments in Qualified Affordable Housing Projects (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Investment In Qualified Affordable Housing Projects.
Tax Credits and Benefits	$ 2,400,000	$ 1,500,000
Amortization		1,200,000
Share of book losses	2,000,000
Carrying value	37,600,000	25,600,000
Original Investment Value	49,700,000	49,700,000
Funding obligation	16,900,000	$ 8,700,000
Amount repaid	$ 0