Consolidated Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	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, Adjusted Balance	Accumulated Other Comprehensive Income (loss) [Member]	Accumulated Other Comprehensive Income (loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock, Common	Treasury Stock, Common Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2021		$ 0		$ 461,800		$ 776,294		$ 15,155		$ (142,490)
Net Income	$ 38,875					38,875
Other comprehensive income (loss)	(55,624)							(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	$ 2,000			1,981
Balance at Mar. 31, 2022		0		459,271		797,033		(40,469)		(139,469)
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, 2022	$ 1,069,226	0	$ 0	462,404	$ 462,404	847,235	$ 846,932	(102,394)	$ (102,394)	(138,019)	$ (138,019)	$ (303)
Net Income	33,733					33,733
Other comprehensive income (loss)	12,361							12,361
Dividends on common shares						(17,285)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures				5,309		862				3,564
Share-based Payment Arrangement, Expense	2,300			2,336
Balance at Mar. 31, 2023	$ 1,082,153	$ 0		$ 459,431		$ 862,518		$ (90,033)		$ (149,763)
Common Stock, Dividends, Per Share, Cash Paid	$ 1.05
Stock Issued During Period, Shares, Restricted Stock Award, Gross	34,484
Stock issued during period, shares, withheld for tax, tax restricted stock	21,981
Stock Repurchased During Period, Shares	124,000
Stock Repurchased During Period, Value	$ (15,308)