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Stock-based Payments and Director Fees - Schedule of Restricted Stock Plans (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)	151,667	229,667	151,667	229,667
Total expected cost of grant	$ 2,102	$ 3,121	$ 2,102	$ 3,121
Shares granted during the year (in shares)	0	0	0	0
Grant expense recognized	$ 174	$ 219	$ 348	$ 482
Shares, nonvested (in shares)	114,334	106,222	114,334	106,222
Per share grant fair value (in dollars per share)	$ 13.87	$ 13.64	$ 13.87	$ 13.64
Shares, fully vested (in shares)	37,333	123,445	37,333	123,445
Per share grant date fair value (in dollars per share)	$ 13.84	$ 13.55	$ 13.84	$ 13.55
Directors’ Grants | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)		12,000		12,000
Total expected cost of grant		$ 162		$ 162
Shares granted during the year (in shares)		0		0
Grant expense recognized		$ 0		$ 14
Shares, nonvested (in shares)		0		0
Per share grant fair value (in dollars per share)		$ 13.48		$ 13.48
Shares, fully vested (in shares)		12,000		12,000
Per share grant date fair value (in dollars per share)		$ 13.48		$ 13.48
Employee And Service Provider Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)		144,667		144,667
Total expected cost of grant		$ 1,953		$ 1,953
Shares granted during the year (in shares)		0		0
Grant expense recognized		$ 143		$ 306
Shares, nonvested (in shares)		46,222		46,222
Per share grant fair value (in dollars per share)		$ 13.50		$ 13.50
Shares, fully vested (in shares)		98,445		98,445
Per share grant date fair value (in dollars per share)		$ 13.50		$ 13.50
Weighted average remaining contractual terms		1 month 6 days		1 month 6 days
Employee and Service Provider Second Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)	38,667	39,000	38,667	39,000
Total expected cost of grant	$ 539	$ 544	$ 539	$ 544
Shares granted during the year (in shares)	0	0	0	0
Grant expense recognized	$ 44	$ 45	$ 88	$ 90
Shares, nonvested (in shares)	12,667	26,000	12,667	26,000
Per share grant fair value (in dollars per share)	$ 13.95	$ 13.95	$ 13.95	$ 13.95
Shares, fully vested (in shares)	26,000	13,000	26,000	13,000
Per share grant date fair value (in dollars per share)	$ 13.95	$ 13.95	$ 13.95	$ 13.95
Weighted average remaining contractual terms	1 month 6 days	1 year 1 month 6 days	1 month 6 days	1 year 1 month 6 days
Employee And Service Provider Grants Third Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)	34,000	34,000	34,000	34,000
Total expected cost of grant	$ 462	$ 462	$ 462	$ 462
Shares granted during the year (in shares)	0	0	0	0
Grant expense recognized	$ 38	$ 31	$ 76	$ 72
Shares, nonvested (in shares)	22,667	34,000	22,667	34,000
Per share grant fair value (in dollars per share)	$ 13.58	$ 13.58	$ 13.58	$ 13.58
Shares, fully vested (in shares)	11,333	0	11,333	0
Per share grant date fair value (in dollars per share)	$ 13.58	$ 0	$ 13.58	$ 0
Weighted average remaining contractual terms	1 year 1 month 6 days	2 years 1 month 6 days	1 year 1 month 6 days	2 years 1 month 6 days
Employee And Service Provider Grants Fourth Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)	79,000		79,000
Total expected cost of grant	$ 1,101		$ 1,101
Shares granted during the year (in shares)	0		0
Grant expense recognized	$ 92		$ 184
Shares, nonvested (in shares)	79,000		79,000
Per share grant fair value (in dollars per share)	$ 13.94		$ 13.94
Shares, fully vested (in shares)	0		0
Per share grant date fair value (in dollars per share)	$ 0		$ 0
Weighted average remaining contractual terms	2 years 1 month 6 days		2 years 1 month 6 days
Long Term Incentive Plan [Member] | Employee And Service Provider Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares forfeited (in shares)				1,667		2,666	4,000
Long Term Incentive Plan [Member] | Employee And Service Provider Grants Third Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares forfeited (in shares)					2,500

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