CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Beginning Balance at Dec. 31, 2017	$ 240	$ 38,418	$ 96,525	$ (68)	$ 135,115
Beginning Balance (in shares) at Dec. 31, 2017	24,074,882
Stockholders' Equity
Stock based compensation expense		924			924
Vesting of restricted stock	$ 2	(2)
Vesting of restricted stock (in shares)	183,180
Net income			31,598		31,598
Impact of adoption of new accounting standard | Accounting Standards Update 2018-02			(13)	13
Other comprehensive income (loss)				(77)	(77)
Dividends on common stock			(6,838)		(6,838)
Ending Balance at Sep. 30, 2018	$ 242	39,340	121,272	(132)	160,722
Ending Balance (in shares) at Sep. 30, 2018	24,258,062
Beginning Balance at Jun. 30, 2018	$ 242	38,765	113,873	(129)	152,751
Beginning Balance (in shares) at Jun. 30, 2018	24,241,206
Stockholders' Equity
Stock based compensation expense		575			575
Vesting of restricted stock (in shares)	16,856
Net income			9,853		9,853
Other comprehensive income (loss)				(3)	(3)
Dividends on common stock			(2,454)		(2,454)
Ending Balance at Sep. 30, 2018	$ 242	39,340	121,272	(132)	160,722
Ending Balance (in shares) at Sep. 30, 2018	24,258,062
Beginning Balance at Dec. 31, 2018	$ 242	39,915	128,555	(104)	168,608
Beginning Balance (in shares) at Dec. 31, 2018	24,258,062
Stockholders' Equity
Stock based compensation expense		1,097			1,097
Vesting of restricted stock	$ 2	(2)
Vesting of restricted stock (in shares)	157,316
Repurchase and retirement of common stock	$ (1)	(1,484)			(1,485)
Repurchase and retirement of common stock (in shares)	(110,000)
Net income			34,048		34,048
Impact of adoption of new accounting standard | 2016-02			(362)		(362)
Other comprehensive income (loss)				105	105
Dividends on common stock			(7,589)		(7,589)
Ending Balance at Sep. 30, 2019	$ 243	39,526	154,652	1	194,422
Ending Balance (in shares) at Sep. 30, 2019	24,305,378
Beginning Balance at Jun. 30, 2019	$ 243	39,096	144,989	(11)	184,317
Beginning Balance (in shares) at Jun. 30, 2019	24,305,378
Stockholders' Equity
Stock based compensation expense		430			430
Net income			12,356		12,356
Other comprehensive income (loss)				12	12
Dividends on common stock			(2,693)		(2,693)
Ending Balance at Sep. 30, 2019	$ 243	$ 39,526	$ 154,652	$ 1	$ 194,422
Ending Balance (in shares) at Sep. 30, 2019	24,305,378