INVESTMENTS - Other Invested Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other invested assets
Investment in low income housing tax credit partnership	$ 5,000
Other Investments	24,115	$ 20,666
Total tax benefit on investments in housing tax credit partnership	1,900	1,100	$ 200
Investment in FHLBC	1,600	1,600
Investment in Real Estate Fund
Other invested assets
Other Investments	5,000	5,000
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization Member
Other invested assets
Other Investments	$ 17,500	$ 14,000