Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Restricted Stock	Restricted Stock Treasury Stock	Performance Based Restricted Stock Awards	Performance Based Restricted Stock Awards Treasury Stock
Beginning balance at Dec. 31, 2016	$ 211,784	$ 77,737	$ 134,295	$ (127)	$ (121)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,860		23,860
Reclassification of certain tax effects from accumulated other comprehensive income to retained earnings	0		237		(237)
Other comprehensive income (loss)	15				15
Forfeiture of restricted stock award grants	0	67		(67)
Restricted stock award grants	0	(984)		984
Stock-based compensation expense	928	928
Issuance of common stock, net of issuance costs	19,294	19,294
Purchase of treasury stock	(1,747)			(1,747)		$ (130)	$ (130)
Cash dividends declared	(10,094)		(10,094)
Ending balance at Dec. 31, 2017	243,910	97,042	148,298	(1,087)	(343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,719		33,719
Reclassification of certain tax effects from accumulated other comprehensive income to retained earnings					0
Other comprehensive income (loss)	(3,653)				(3,653)
Forfeiture of restricted stock award grants	0	11		(11)
Restricted stock award grants	0	(996)		996
Stock-based compensation expense	1,545	1,545
Purchase of treasury stock	(2,284)			(2,284)		(170)	(170)
Cash dividends declared	(10,237)		(10,237)
Ending balance at Dec. 31, 2018	262,830	97,602	171,780	(2,556)	(3,996)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,081		40,081
Reclassification of certain tax effects from accumulated other comprehensive income to retained earnings					0
Other comprehensive income (loss)	10,935				10,935
Forfeiture of restricted stock award grants	0	71		(71)
Restricted stock award grants	0	(1,086)		1,086
Performance based restricted stock award grants	0	(21)		21
Stock-based compensation expense	1,346	1,346
Issuance of common stock, net of issuance costs	1,423	1,423
Purchase of treasury stock	(994)			(994)		$ (289)	$ (289)	$ (8)	$ (8)
Cash dividends declared	(10,358)		(10,358)
Ending balance at Dec. 31, 2019	304,966	99,335	201,503	(2,811)	6,939
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,484
Ending balance at Dec. 31, 2019	$ 304,966	$ 99,335	$ 201,503	$ (2,811)	$ 6,939