Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 15,900,000		$ 15,900,000		$ 18,600,000
Open commitments	0		0		$ 0
Amortization expense included in noninterest expense	900,000	$ 1,000,000	2,800,000	$ 3,100,000
Tax credits	$ 1,000,000	$ 1,100,000	$ 3,000,000	$ 3,300,000