Earnings Per Share - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 15, 2015
2015 Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized stock repurchase amount (up to)					$ 10,000,000
Shares repurchased (in shares)	26,800	104,300
Shares repurchased amount	$ 489,000	$ 1,900,000
Average price (in dollars per share)	$ 18.29	$ 18.34
1999 Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Shares remaining for repurchase (in shares)					24,084
Employee Stock Option [Member]
Equity, Class of Treasury Stock [Line Items]
Anti-dilutive securities		0	0	0