Goodwill and Other Intangible Assets, Net Goodwill Rollforward (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning of year				$ 22,900,000				$ 22,900,000	$ 22,900,000	$ 22,900,000
Goodwill, end of year	$ 36,000,000				$ 22,900,000				36,000,000	22,900,000	$ 22,900,000
Goodwill impairment									0	0	0
Amortization of intangible assets	$ 1,500,000	$ 1,700,000	$ 1,200,000	$ 900,000	$ 800,000	$ 600,000	$ 600,000	$ 600,000	5,300,000	2,600,000	$ 2,600,000
Pine State
Goodwill [Roll Forward]
Pine State acquisition									$ 13,100,000	$ 0