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Other Comprehensive Income (Loss), Summary of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 184,661	$ 183,304	$ 181,372	$ 181,321	$ 179,882	$ 177,537	$ 174,910	$ 172,521	$ 181,321	$ 172,521	$ 167,498
Reclassification adjustment for effect of enacted tax law changes										0
Other comprehensive loss	3,419	(1,677)	(904)	(2,933)	(1,349)	(263)	174	60	(2,095)	(1,378)	(858)
Balance	191,542	$ 184,661	$ 183,304	181,372	181,321	$ 179,882	$ 177,537	174,910	191,542	181,321	172,521
Accumulated Net Gain (Loss) from Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance				$ 1,544				$ 1,163	1,544	1,163	0
Unrealized gains (losses) during the period									(134)	165	1,790
Related deferred taxes									28	(58)	(627)
Reclassification adjustment for effect of enacted tax law changes									0	274	0
Other comprehensive loss									(106)	381	1,163
Balance	$ 1,438				$ 1,544				$ 1,438	$ 1,544	$ 1,163

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Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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