Stock-based Payments and Director Fees - Schedule of Restricted Stock Plans (Details) - Restricted stock - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 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	233,834
Total expected cost of grant	$ 2,102	$ 3,178
Shares granted during the year (in shares)	0	0
Grant expense recognized	$ 174	$ 263
Shares, nonvested (in shares)	114,334	110,389
Per share grant fair value (in dollars per share)	$ 13.87	$ 13.63
Shares, fully vested (in shares)	37,333	123,445
Per share grant date fair value (in dollars per share)	$ 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
Total expected cost of grant		$ 162
Shares granted during the year (in shares)		0
Grant expense recognized		$ 14
Shares, nonvested (in shares)		0
Per share grant fair value (in dollars per share)		$ 13.48
Shares, fully vested (in shares)		12,000
Per share grant date fair value (in dollars per share)		$ 13.48
Employee And Service Provider Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares granted (in shares)		146,334
Total expected cost of grant		$ 1,976
Shares granted during the year (in shares)		0
Grant expense recognized		$ 163
Shares, nonvested (in shares)		47,889
Per share grant fair value (in dollars per share)		$ 13.50
Shares, fully vested (in shares)		98,445
Per share grant date fair value (in dollars per share)		$ 13.50
Weighted average remaining contractual terms		4 months 24 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
Total expected cost of grant	$ 539	$ 544
Shares granted during the year (in shares)	0	0
Grant expense recognized	$ 44	$ 45
Shares, nonvested (in shares)	12,667	26,000
Per share grant fair value (in dollars per share)	$ 13.95	$ 13.95
Shares, fully vested (in shares)	26,000	13,000
Per share grant date fair value (in dollars per share)	$ 13.95	$ 13.95
Weighted average remaining contractual terms	3 months 18 days	1 year 3 months 18 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	36,500
Total expected cost of grant	$ 462	$ 496
Shares granted during the year (in shares)	0	0
Grant expense recognized	$ 38	$ 41
Shares, nonvested (in shares)	22,667	36,500
Per share grant fair value (in dollars per share)	$ 13.58	$ 13.58
Shares, fully vested (in shares)	11,333	0
Per share grant date fair value (in dollars per share)	$ 13.58	$ 0
Weighted average remaining contractual terms	1 year 4 months 24 days	2 years 4 months 24 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
Total expected cost of grant	$ 1,101
Shares granted during the year (in shares)	0
Grant expense recognized	$ 92
Shares, nonvested (in shares)	79,000
Per share grant fair value (in dollars per share)	$ 13.94
Shares, fully vested (in shares)	0
Per share grant date fair value (in dollars per share)	$ 0
Weighted average remaining contractual terms	2 years 3 months 18 days
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares forfeited (in shares)			2,666
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)				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