Shareholders' Equity and Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 18, 2018
Share Repurchase Plan [Abstract]
Share repurchase plan percentage of shares authorized to be repurchased				5.00%
Stock repurchased (in shares)		115,787
Stock repurchased		$ 2,530
Earnings Per Share Reconciliation [Abstract]
Net Income		$ 9,381	$ 9,161
Weighted average shares outstanding (in shares)	[1]	23,588,000	21,365,000
Effect of stock options (in shares)		127,000	135,000
Stock units for deferred compensation plan for non-employee directors (in shares)		130,000	125,000
Performance share units (in shares)		40,000	49,000
Weighted average shares outstanding for calculation of diluted earnings per share (in shares)		23,885,000	21,674,000
Net income per common share [Abstract]
Basic (in dollars per share)	[1]	$ 0.40	$ 0.43
Diluted (in dollars per share)		$ 0.39	$ 0.42
Common Stock [Member]
Share Repurchase Plan [Abstract]
Stock repurchased (in shares)		115,787	0
Stock repurchased		$ 2,530	$ 0
Stock Options [Member]
Antidilutive Securities [Abstract]
Antidilutive shares excluded from computation of diluted loss per share (in shares)		0	0

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