CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings
Beginning balance at Dec. 31, 2018	$ 935,761	$ 90,326	$ 210,345	$ 701,819	$ (23,107)	$ (43,622)	$ 167	$ 167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	98,234			98,234
Other comprehensive income, net of tax	11,437				11,437
Cash dividends declared	(37,360)			(37,360)
Common stock issuance cost	(176)		(176)
Common stock issued in acquisition	200,631	13,297	187,334
Treasury stock repurchased	(18,222)					(18,222)
Treasury stock issued	(915)			(1,777)		862
Recognition of restricted stock compensation expense	2,441		2,441
Ending balance at Dec. 31, 2019	$ 1,191,998	103,623	399,944	761,083	(11,670)	(60,982)	$ (22,590)	$ (22,590)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Net Income	$ 21,040			21,040
Other comprehensive income, net of tax	20,641				20,641
Cash dividends declared	(43,949)			(43,949)
Treasury stock repurchased	(12,559)					(12,559)
Treasury stock issued	(594)			(5,523)		4,929
Recognition of restricted stock compensation expense	724		724
Ending balance at Dec. 31, 2020	1,154,711	103,623	400,668	710,061	8,971	(68,612)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	110,343			110,343
Other comprehensive income, net of tax	(16,061)				(16,061)
Cash dividends declared	(44,336)			(44,336)
Treasury stock repurchased	0
Treasury stock issued	(630)			(2,409)		1,779
Recognition of restricted stock compensation expense	2,427		2,427
Ending balance at Dec. 31, 2021	$ 1,206,454	$ 103,623	$ 403,095	$ 773,659	$ (7,090)	$ (66,833)