Investments is Low Income Housing Tax Credits Investments in Qualified Affordable Housing Projects (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Investments in Affordable Housing Projects [Abstract]
Original investment value	$ 42,162	$ 42,199
Amortization Method Qualified Affordable Housing Project Investments	37,177	38,151
Capital commitment relating to low income housing project investments	11,922	14,607
Tax credits and benefits (1)	5,419	3,632
Amortization of investments (2)	3,751	2,450
Net income tax benefit (3)	$ 1,668	$ 1,182