Shareholders' Equity and Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Jan. 23, 2017
Earnings Per Share Reconciliation [Abstract]
Net income		$ 5,974	$ 4,100
Weighted average shares outstanding (in shares)	[1]	21,308	21,751
Effect of stock options (in shares)		152	112
Stock units for deferred compensation plan for non-employee directors (in shares)		119	113
Performance share units (in shares)		60	0
Restricted stock units (in shares)		0	86
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)		21,639	22,062
Net income per common share [Abstract]
Basic (in dollars per share)	[1]	$ 0.28	$ 0.19
Diluted (in dollars per share)		$ 0.28	$ 0.19
Common Stock [Member]
Class of Stock [Line Items]
Stock repurchase program percentage of shares authorized to be repurchased				5.00%
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted loss per share (in shares)		0	30

[1] Basic net income per common share includes weighted average common shares outstanding during the period and participating share awards.