Common Stock (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	May 04, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) Employee $ / shares shares	Sep. 30, 2020 USD ($) Employee shares	Sep. 30, 2021 USD ($) Employee $ / shares shares	Sep. 30, 2020 USD ($) Employee shares	Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Number of voluntary terminations | Employee		2	1	2	1
Employee [Member] | Minimum [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				1 year
Employee [Member] | Maximum [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				4 years
Director [Member]
Class of Stock [Line Items]
Restricted shares, vesting period				12 months
Dividend Reinvestment Plan [Member]
Class of Stock [Line Items]
Shares authorized per plan		330,750		330,750
2014 Restricted Stock Plan [Member]
Class of Stock [Line Items]
Aggregate shares granted				200,000
Shares granted				117,569
Allocated share-based compensation expense | $		$ 227,000	$ 104,000	$ 533,000	$ 265,000
Shares forfeited and available for reissuance				4,873
Restricted shares vested during period				63,874
Granted shares unvested		48,822		48,822
Shares forfeited		2,427	100	2,427	100
Underwritten Public Offering [Member]
Class of Stock [Line Items]
Number of shares issued	2,990,000
Common stock, price per share | $ / shares	$ 25.00
Net proceeds received after underwriting discount and other estimated offering expenses | $	$ 70,238,000
Net proceeds of the offering | $	4,512,000
Proceeds from follow-on common stock public offering | $	$ 74,750,000			$ 70,238,000
Treasury Stock Repurchase Program [Member]
Class of Stock [Line Items]
Stock repurchase program, authorized amount | $		$ 15,000,000		$ 15,000,000
Percentage of issued shares based on closing stock price		4.70%		4.70%
Stock repurchased during period, shares				98,452		92,652
Stock repurchased at average price per share | $ / shares		$ 19.53		$ 19.53		$ 19.37