Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, 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, Net of Tax [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2018	$ 88,665	$ 223,161	$ 258,935	$ (6,611)	$ 564,150	$ 88,665	$ 223,161	$ 258,455	$ (6,611)	$ 563,670
Balance (ASU 2016-02 [Member]) at Dec. 31, 2018								(480)	0	(480)
Balance (in shares) at Dec. 31, 2018	17,732,853					17,732,853
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			64,540		64,540
Other comprehensive income (loss)				10,864	10,864
Cash dividends declared			(26,235)		(26,235)
Issuance of common stock	$ 228	1,036			1,264
Issuance of common stock (in shares)	45,639
Issuance of restricted stock	$ 140	(140)			0
Issuance of restricted stock (in shares)	27,921
Vesting of restricted stock	$ (64)	64			0
Vesting of restricted stock (in shares)	(12,660)
Forfeiture of restricted stock	$ (3)	3			0
Forfeiture of restricted stock (in shares)	(588)
Stock-based compensation		783			783
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			59,504		59,504
Other comprehensive income (loss)				9,315	9,315
Cash dividends declared			(27,160)		(27,160)
Issuance of common stock	$ 226	700			926
Issuance of common stock (in shares)	45,341
Repurchase of common stock	$ (163)	(936)			(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	$ (85)	85			0
Vesting of restricted stock (in shares)	(16,985)
Stock-based compensation		859			859
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			87,939		$ 87,939
Other comprehensive income (loss)				(18,416)	(18,416)
Cash dividends declared			(27,927)		(27,927)
Issuance of common stock	$ 205	760			965
Issuance of common stock (in shares)	41,168
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		776			776
Balance at Dec. 31, 2021	$ 89,215	$ 227,085	$ 386,750	$ (4,848)	$ 698,202
Balance (in shares) at Dec. 31, 2021	17,843,081				17,843,081