Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock [Member]	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus[Member]	Capital Surplus[Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock, Common [Member]	Treasury Stock, Common [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2019	$ 657,983	$ (2,335)	$ 655,648	$ 47,619	$ 47,619	$ 170,309	$ 170,309	$ 539,253	$ (2,335)	$ 536,918	$ (105,038)	$ (105,038)	$ 5,840	$ 5,840
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Available to Common Shareholders	89,595							89,595
Other comprehensive income	25,393												25,393
Cash dividends declared	(36,525)							(36,525)
Stock-based compensation expense, net	3,253					3,253
Restricted Awards Granted	$ 0					(2,146)					2,146
Exercise of stock options	4,921
Exercise of stock options	$ 223					(112)					335
Purchase of treasury shares	(36,481)										(36,481)
Ending balance at Dec. 31, 2020	701,106			47,619		171,304		589,988			(139,038)		31,233
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Available to Common Shareholders	88,080							88,080
Other comprehensive income	(16,973)												(16,973)
Cash dividends declared	(36,242)							(36,242)
Stock-based compensation expense, net	3,121					3,121
Restricted Awards Granted	$ 0					(1,860)					1,860
Exercise of stock options	14,603
Exercise of stock options	$ 691					(1,623)					2,314
Purchase of treasury shares	(58,678)										(58,678)
Ending balance at Dec. 31, 2021	681,105			47,619		170,942		641,826			(193,542)		14,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income Available to Common Shareholders	102,071							102,071
Other comprehensive income	(145,748)												(145,748)
Cash dividends declared	(37,201)							(37,201)
Stock-based compensation expense, net	3,276					3,276
Restricted Awards Granted	$ 0					(2,821)					2,821
Exercise of stock options	15,141
Exercise of stock options	$ 798					(417)					1,215
Purchase of treasury shares	(26,449)										(26,449)
Ending balance at Dec. 31, 2022	$ 577,852			$ 47,619		$ 170,980		$ 706,696			$ (215,955)		$ (131,488)