Investments is Low Income Housing Tax Credits Investments in Qualified Affordable Housing Projects (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Original investment value	$ 42,626	$ 40,541
Amortization Method Qualified Affordable Housing Project Investments	38,929	38,943
Capital commitment relating to low income housing project investments	15,272	28,004
Tax credits and benefits (1)	4,151	1,683
Amortization of investments (2)	2,840	1,089
Net income tax benefit (3)	$ 1,314	$ 594