Investments is Low Income Housing Tax Credits Investments in Qualified Affordable Housing Projects (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investments in Low Income Housing Tax Credits [Abstract]
Original investment value	$ 40,541	$ 40,541
Current recorded investment	38,305	38,943
Capital commitment relating to low income housing project investments	23,002	28,004
Tax credits and benefits (1)	4,554	1,683
Amortization of investments (2)	3,045	1,089
Net income tax benefit (3)	$ 1,509	$ 594