Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2018	$ 210,296	$ (53)	$ 210,243	$ 174,366	$ 174,366	$ 37,577	$ (53)	$ 37,524	$ (1,647)	$ (1,647)
Beginning balance (in shares) at Dec. 31, 2018				15,977,754	15,977,754
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,950					19,950
Other comprehensive income, net of tax	2,298								2,298
Issuance of restricted stock (in shares)				37,700
Repurchase of common stock (in shares)				(374,069)
Repurchase of common stock	(6,104)			$ (6,104)
Share-based compensation expense	503			$ 503
Stock options exercised (in shares)				68,902
Stock options exercised	459			$ 459
Cash dividends declared on common stock	(2,706)					(2,706)
Ending balance at Sep. 30, 2019	224,643			$ 169,224		54,768			651
Ending balance (in shares) at Sep. 30, 2019				15,710,287
Beginning balance at Jun. 30, 2019	223,400			$ 174,135		48,927			338
Beginning balance (in shares) at Jun. 30, 2019				15,980,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,785					6,785
Other comprehensive income, net of tax	313								313
Issuance of restricted stock (in shares)				37,700
Repurchase of common stock (in shares)				(316,518)
Repurchase of common stock	(5,130)			$ (5,130)
Share-based compensation expense	180			$ 180
Stock options exercised (in shares)				8,450
Stock options exercised	39			$ 39
Cash dividends declared on common stock	(944)					(944)
Ending balance at Sep. 30, 2019	224,643			$ 169,224		54,768			651
Ending balance (in shares) at Sep. 30, 2019				15,710,287
Beginning balance at Dec. 31, 2019	$ 226,834			$ 169,221		57,670			(57)
Beginning balance (in shares) at Dec. 31, 2019	15,707,016			15,707,016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 10,388					10,388
Other comprehensive income, net of tax	1,993								1,993
Issuance of restricted stock (in shares)				1,900
Restricted stock surrendered due to employee tax liability (in shares)				(165)
Restricted stock surrendered due to employee tax liability	(2)			$ (2)
Repurchase of common stock (in shares)				(428,474)
Repurchase of common stock	(6,487)			$ (6,487)
Share-based compensation expense	$ 592			$ 592
Stock options exercised (in shares)	99,261			99,261
Stock options exercised	$ 636			$ 636
Cash dividends declared on common stock	(4,615)					(4,615)
Ending balance at Sep. 30, 2020	$ 229,339			$ 163,960		63,443			1,936
Ending balance (in shares) at Sep. 30, 2020	15,379,538			15,379,538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning balance at Jun. 30, 2020	$ 227,233			$ 163,759		61,532			1,942
Beginning balance (in shares) at Jun. 30, 2020				15,377,935
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,449					3,449
Other comprehensive income, net of tax	(6)								(6)
Issuance of restricted stock (in shares)				900
Restricted stock surrendered due to employee tax liability (in shares)				(165)
Restricted stock surrendered due to employee tax liability	(2)			$ (2)
Share-based compensation expense	$ 200			$ 200
Stock options exercised (in shares)	868			868
Stock options exercised	$ 3			$ 3
Cash dividends declared on common stock	(1,538)					(1,538)
Ending balance at Sep. 30, 2020	$ 229,339			$ 163,960		$ 63,443			$ 1,936
Ending balance (in shares) at Sep. 30, 2020	15,379,538			15,379,538