Stock Offerings (Details) - USD ($)		1 Months Ended							3 Months Ended	9 Months Ended
	Aug. 12, 2019	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Total number of shares purchased (in shares)	49,100	58,392	20,532	3,500	29,200	100	0	16,300	82,424	128,024
Value of shares repurchased	$ 706,000								$ 1,300,000	$ 1,900,000
Authorized repurchase amount	$ 5,000,000.0
Stock repurchase program, period	12 months
Average price paid per share (in dollars per share)		$ 15.63	$ 13.99	$ 12.89	$ 13.53	$ 14.18	$ 0	$ 16.00