Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 10,000,000		$ 10,000,000		$ 11,700,000
Open commitments to fund future investments	0		0		$ 0
Amortization expense included in noninterest expense	800,000	$ 800,000	2,300,000	$ 2,500,000
Tax credits	$ 900,000	$ 900,000	$ 2,600,000	$ 2,700,000