Share Repurchase Plan - Repurchase Activity (Details) - 2016 Stock Repurchase Program - USD ($)	3 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2016	May 31, 2016
Equity, Class of Treasury Stock [Line Items]
Remaining authorized repurchase amount for beginning of period	$ 29,100,000	$ 29,100,000	$ 29,100,000
Total number of shares repurchased (in shares)	181,619	219,519	219,519
Average price paid per share (in dollars per share)	$ 24.62		$ 24.38
Total value of shares repurchased	$ 4,500,000		$ 5,400,000
Total authorized repurchase amount	30,000,000.0	$ 30,000,000.0	30,000,000.0	$ 30,000,000
Total remaining authorized repurchase amount	$ 24,600,000	$ 24,600,000	$ 24,600,000