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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	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]
ESPP compensation expense	$ 29	$ 41	$ 125	$ 189
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Allocated share-based compensation expense	1,500	915	2,300	1,900
Tax benefit from compensation expense	$ 378	$ 237	$ 585	$ 482
Stock options
Number of Shares
Outstanding - beginning of period (in shares)			982,631
Granted (in shares)			0
Exercised (in shares)			0
Expired (in shares)			(18,962)
Forfeited (in shares)			(18,000)
Outstanding - end of period (in shares)	945,669		945,669
Weighted- Average Exercise Price Per Share
Outstanding - beginning of period (in dollars per share)			$ 15.41
Granted (in dollars per share)			0
Exercised (in dollars per share)			0
Expired (in dollars per share)			16.67
Forfeited (in dollars per share)			17.18
Outstanding - end of period (in dollars per share)	$ 15.35		$ 15.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable - end of period (in shares)	799,669		799,669
Options exercisable, Weighted-Average Exercise Price Per Share (in dollars per share)	$ 15.02		$ 15.02
Outstanding, Weighted-Average Remaining Contractual Life (Years)			5 years 11 months 26 days
Options exercisable, Weighted-Average Remaining Contractual Life (Years)			5 years 9 months 10 days
Outstanding, Aggregate Intrinsic Value	$ 926		$ 926
Options exercisable, Aggregate Intrinsic Value	$ 926		$ 926

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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