Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]	Total	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Capital Surplus [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2019	$ 88,966	$ 224,907	$ 296,760	$ 4,253	$ 614,886	$ 88,966	$ 224,907	$ 294,394	$ 4,253	$ 612,520
Balance (ASU 2016-13 [Member]) at Dec. 31, 2019								$ (2,366)		$ (2,366)
Balance (in shares) at Dec. 31, 2019	17,793,165					17,793,165
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			6,579		6,579
Other comprehensive income (loss), net of tax				1,233	1,233
Cash dividends declared			(6,750)		(6,750)
Issuance of common stock	$ 110	122			232
Issuance of common stock (in shares)	21,953
Repurchase of common stock	$ (164)	(935)			(1,099)
Repurchase of common stock (in shares)	(32,664)
Issuance of restricted stock	$ 108	(108)			0
Issuance of restricted stock (in shares)	21,544
Vesting of restricted stock	$ (84)	84			0
Vesting of restricted stock (in shares)	(16,724)
Stock-based compensation		207			207
Balance at Mar. 31, 2020	$ 88,936	224,277	294,223	5,486	612,922
Balance (in shares) at Mar. 31, 2020	17,787,274
Balance at Dec. 31, 2020	$ 89,052	225,507	326,738	13,568	$ 654,865
Balance (in shares) at Dec. 31, 2020	17,810,401				17,810,401
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			23,618		$ 23,618
Other comprehensive income (loss), net of tax				(10,002)	(10,002)
Cash dividends declared			(6,845)		(6,845)
Issuance of common stock	$ 121	117			238
Issuance of common stock (in shares)	24,163
Issuance of restricted stock	$ 46	(46)			0
Issuance of restricted stock (in shares)	9,193
Vesting of restricted stock	$ (88)	88			0
Vesting of restricted stock (in shares)	(17,681)
Stock-based compensation		195			195
Balance at Mar. 31, 2021	$ 89,131	$ 225,861	$ 343,511	$ 3,566	$ 662,069
Balance (in shares) at Mar. 31, 2021	17,826,076				17,826,076