Share-Based Compensation Plans - Company's restricted stock award activity (Details) - Restricted Stock [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of Restricted Stock, Non-vested beginning of period | shares	68,735
Shares of Restricted Stock, Issued | shares	30,800
Shares of Restricted Stock, Vested | shares	(27,045)
Shares of Restricted Stock, Non-vested end of period | shares	72,490
Weighted Average Grant Date Fair Value, Non-vested beginning of period (in dollars per share) | $ / shares	$ 28.04
Weighted Average Grant Date Fair Value, Issued (in dollars per share) | $ / shares	18.00
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	18.39
Weighted Average Grant Date Fair Value, Non-vested end of period (in dollars per share) | $ / shares	$ 23.77
Weighted Average Remaining Contractual Term (Years)	3 years
Aggregate Intrinsic Value | $	$ 1,172,000