Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 10,200,000		$ 10,200,000		$ 11,700,000
Open commitments to fund future investments	0		0		$ 0
Amortization expense included in noninterest expense	800,000	$ 800,000	1,600,000	$ 1,600,000
Tax credits	$ 900,000	$ 900,000	$ 1,700,000	$ 1,800,000