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
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
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			68,691		68,691
Other comprehensive loss				(12,405)	(12,405)
Cash dividends declared			(20,808)		(20,808)
Issuance of common stock	$ 178	541			719
Issuance of common stock (in shares)	35,400
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		581			581
Balance at Sep. 30, 2021	$ 89,188	226,671	374,621	1,163	691,643
Balance (in shares) at Sep. 30, 2021	17,837,313
Balance at Jun. 30, 2021	$ 89,158	226,268	360,595	8,062	684,083
Balance (in shares) at Jun. 30, 2021	17,831,479
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			21,142		21,142
Other comprehensive loss				(6,899)	(6,899)
Cash dividends declared			(7,116)		(7,116)
Issuance of common stock	$ 30	209			239
Issuance of common stock (in shares)	5,834
Stock-based compensation		194			194
Balance at Sep. 30, 2021	$ 89,188	226,671	374,621	1,163	691,643
Balance (in shares) at Sep. 30, 2021	17,837,313
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
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			59,371		$ 59,371
Other comprehensive loss				(134,588)	(134,588)
Cash dividends declared			(22,115)		(22,115)
Issuance of common stock	$ 224	531			755
Issuance of common stock (in shares)	44,758
Issuance of restricted stock	$ 202	(202)			0
Issuance of restricted stock (in shares)	40,438
Vesting of restricted stock	$ (135)	135			0
Vesting of restricted stock (in shares)	(26,904)
Stock-based compensation		935			935
Balance at Sep. 30, 2022	$ 89,506	228,484	424,006	(139,436)	$ 602,560
Balance (in shares) at Sep. 30, 2022	17,901,373				17,901,373
Balance at Jun. 30, 2022	$ 89,475	228,020	412,484	(97,929)	$ 632,050
Balance (in shares) at Jun. 30, 2022	17,895,181
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			19,372		19,372
Other comprehensive loss				(41,507)	(41,507)
Cash dividends declared			(7,850)		(7,850)
Issuance of common stock	$ 31	225			256
Issuance of common stock (in shares)	6,192
Stock-based compensation		239			239
Balance at Sep. 30, 2022	$ 89,506	$ 228,484	$ 424,006	$ (139,436)	$ 602,560
Balance (in shares) at Sep. 30, 2022	17,901,373				17,901,373