Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Abstract]
FHLBI stock	$ 74,250	$ 74,250
Investments in unconsolidated ventures	28,168	25,972
Investment in exchange-traded fund	3,966	3,979
Prepaid expenses and other assets	988	1,379
Total	$ 107,372	$ 105,580