Treasury Stock Narrative Data (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased per quarter (in shares)	2,500
Purchase of treasury stock, cost		$ 13
Number of shares of common stock repurchased since inception of stock repurchase program (in shares)	17,693
Cost per share of common stock repurchased since inception of stock repurchase program, low (in usd per share)	$ 17.86
Cost per share of common stock repurchased since inception of stock repurchase program, high (in usd per share)	$ 48.82
Total cost of common stock repurchased since inception of stock repurchase program	$ 472
Number of shares of common stock reserved for issuance and sale under the DRIP (in shares)	200,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock, shares (in shares)	0	300
Shares issued under the DRIP (in shares)	4,139
Treasury stock
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock, cost		$ 13