Qualified Affordable Housing Projects (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Qualified Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 17,700,000		$ 18,600,000
Open commitments	0		0
Amortization expense included in noninterest expense	900,000	1,000,000
Tax credits	$ 1,000,000	$ 1,100,000