Consolidated Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Preferred Stock [Member]	Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock [Member]	Common Stock [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 At Cost [Member]	Treasury Stock At Cost [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
Balance at Dec. 31, 2020		$ (8,000)	$ 0	$ 0	$ 460,687	$ 460,687	$ 704,764		$ 696,808	$ (130,766)	$ (130,766)	$ 5,571	$ 5,571
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2020								$ (7,956)
Net Income							42,831
Other comprehensive income (loss)												(13,472)
Dividends on common shares							(20,365)
Cash payment for fractional shares in dividend reinvestment plan					(1)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures					3,988		44			2,174
Share-based Payment Arrangement, Expense					1,836
Balance at Mar. 31, 2021			0		458,534		719,230			(128,592)		(7,901)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.23
Stock Issued During Period, Shares, Restricted Stock Award, Gross	21,764
Stock issued during period, shares, withheld for tax, tax restricted stock	14,108
Balance at Dec. 31, 2020		$ (8,000)	0	$ 0	460,687	$ 460,687	704,764		$ 696,808	(130,766)	$ (130,766)	5,571	$ 5,571
Balance (Accounting Standards Update 2016-13) at Dec. 31, 2020								$ (7,956)
Net Income	$ 117,397
Other comprehensive income (loss)	(13,381)
Share-based Payment Arrangement, Expense	$ 4,500
Balance at Sep. 30, 2021			0		459,953		759,619			(143,850)		(7,810)
Stock issued during period, shares, withheld for tax, tax restricted stock	18,429
Balance at Mar. 31, 2021			0		458,534		719,230			(128,592)		(7,901)
Net Income							39,132
Other comprehensive income (loss)												4,971
Dividends on common shares							(17,081)
Cash payment for fractional shares in dividend reinvestment plan					(2)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures					743		126			483
Share-based Payment Arrangement, Expense					1,487
Balance at Jun. 30, 2021			0		459,276		741,155			(128,109)		(2,930)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.03
Stock Issued During Period, Shares, Restricted Stock Award, Gross	4,834
Stock issued during period, shares, withheld for tax, tax restricted stock	2,973
Net Income	$ 35,434						35,434
Other comprehensive income (loss)	(4,880)											(4,880)
Dividends on common shares							(16,999)
Cash payment for fractional shares in dividend reinvestment plan					(1)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures					495		29			307
Share-based Payment Arrangement, Expense	$ 1,200				1,173
Balance at Sep. 30, 2021			0		459,953		759,619			(143,850)		(7,810)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.03
Stock Issued During Period, Shares, Restricted Stock Award, Gross	3,079
Stock issued during period, shares, withheld for tax, tax restricted stock	1,348
Stock Repurchased During Period, Shares	137,659
Stock Repurchased During Period, Value	$ (16,048)
Balance at Dec. 31, 2021	$ 1,110,759		0		461,800		776,294			(142,490)		15,155
Net Income							38,875
Other comprehensive income (loss)												(55,624)
Dividends on common shares							(17,172)
Cash payment for fractional shares in dividend reinvestment plan					(2)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures					4,508		964			3,021
Share-based Payment Arrangement, Expense					1,981
Balance at Mar. 31, 2022			0		459,271		797,033			(139,469)		(40,469)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.04
Stock Issued During Period, Shares, Restricted Stock Award, Gross	29,757
Stock issued during period, shares, withheld for tax, tax restricted stock	18,658
Balance at Dec. 31, 2021	$ 1,110,759		0		461,800		776,294			(142,490)		15,155
Net Income	115,267
Other comprehensive income (loss)	(140,498)
Share-based Payment Arrangement, Expense	4,800
Balance at Sep. 30, 2022	$ 1,036,172		0		461,321		839,207			(139,013)		(125,343)
Stock issued during period, shares, withheld for tax, tax restricted stock	21,217
Balance at Mar. 31, 2022			0		459,271		797,033			(139,469)		(40,469)
Net Income							34,324
Other comprehensive income (loss)												(44,935)
Dividends on common shares							(17,116)
Share-based Payment Arrangement, Expense					1,374
Balance at Jun. 30, 2022			0		460,645		814,241			(139,469)		(85,404)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.04
Net Income	$ 42,068						42,068
Other comprehensive income (loss)	(39,939)											(39,939)
Dividends on common shares							(17,101)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures					765		1			456
Share-based Payment Arrangement, Expense	1,400				1,441
Balance at Sep. 30, 2022	$ 1,036,172		$ 0		$ 461,321		$ 839,207			$ (139,013)		$ (125,343)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.04
Stock Issued During Period, Shares, Restricted Stock Award, Gross	4,490
Stock issued during period, shares, withheld for tax, tax restricted stock	2,559