Shareholders' Equity and Share-Based Compensation Share-based Compensation (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based incentive plan, number of shares authorized for issuance		1,000,000		1,000,000
Stock-based compensation expense		$ 296,000	$ 294,000	$ 593,000	$ 629,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 1,870,000		$ 1,870,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Rollforward]
Restricted stock outstanding as of beginning of period (2)	[1]			113,904	117,701
Restricted stock granted				67,997	71,051
Restricted stock vested (2)	[1]			(62,688)	(74,849)
Restricted stock outstanding as of end of period (2)	[1]	119,213	113,904	119,213	113,904
Restricted stock as of beginning of period of period, nonvested, weighted average grant date fair value per share	[1]			$ 19.19	$ 21.02
Restricted stock granted, weighted average grant date fair value per share				18.09	18.95
Restricted stock vested, weighted average grant date fair value per share	[1]			19.20	21.85
Restricted stock as of end of period, nonvested, weighted average grant date fair value per share	[1]	$ 18.56	$ 19.19	$ 18.56	$ 19.19

[1] Amounts include awards previously granted under the 2009 Plan which will remain outstanding in accordance with their terms. The Company is no longer granting new equity awards under the 2009 Plan.