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Treasury Stock - Additional Information (Details) - Share Repurchase Program August 2017 - USD ($)		1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 07, 2018	Aug. 31, 2017	Jun. 30, 2019	Jun. 30, 2019
Equity Class Of Treasury Stock [Line Items]
Common stock repurchase, value			$ 3,600,000	$ 3,600,000
Common Stock
Equity Class Of Treasury Stock [Line Items]
Stock approved for repurchase, value		$ 7,000,000
Period of stock repurchase program		12 months
Additional period of stock repurchase program	12 months
Stock repurchase, shares			0	14,350
Stock repurchase, average price per share				$ 13.44
Stock repurchase, cost				$ 193,000

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