Consolidated Statements of Shareholders' 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	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock, Common [Member]	Treasury Stock, Common [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	AOCI Attributable to Parent [Member]	AOCI Attributable to Parent [Member] Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2020		$ 0	$ 0	$ 460,687	$ 460,687	$ 704,764		$ 696,808	$ (130,766)	$ (130,766)	$ 5,571	$ 5,571
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2020							$ (7,956)
Beginning balance, shares at Dec. 31, 2020		0	0	16,314,197	16,314,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	$ 153,945					153,945
Other Comprehensive Income (Loss), Net of Tax	9,584										9,584
Dividends, Common Stock, Cash						74,634
Stock Issued During Period, Shares, Dividend Reinvestment Plan				45
Stock Issued During Period, Value, Dividend Reinvestment Plan				$ 6
Allocated Share-based Compensation Expense	$ 6,300			$ 6,345
Shares Paid for Tax Withholding for Share Based Compensation	18,436
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	29,670			29,670
Stock Granted, Value, Share-based Compensation, Net of Forfeitures				$ (5,226)		141			(2,964)
Treasury Stock, Shares, Acquired				137,659
Treasury Stock, Value, Acquired, Cost Method									(16,048)
Treasury Stock Reissued Shares For Director Grants	13,400			13,400
Treasury shares reissued for director grants						(316)			1,360
Ending balance, shares at Dec. 31, 2021		0		16,219,563
Ending balance at Dec. 31, 2021		$ 0		$ 461,800		776,294			(142,490)		15,155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 4.52
Net Income (Loss) Attributable to Parent	$ 148,351					148,351
Other Comprehensive Income (Loss), Net of Tax	(117,549)										(117,549)
Dividends, Common Stock, Cash						76,771
Stock Issued During Period, Shares, Dividend Reinvestment Plan				14
Stock Issued During Period, Value, Dividend Reinvestment Plan				$ 2
Allocated Share-based Compensation Expense	$ 5,900			$ 5,879
Shares Paid for Tax Withholding for Share Based Compensation	21,219
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	34,245			34,245
Stock Granted, Value, Share-based Compensation, Net of Forfeitures				$ (5,273)		(965)			(3,477)
Treasury Stock Reissued Shares For Director Grants	9,789			9,789
Treasury shares reissued for director grants						326			994
Ending balance, shares at Dec. 31, 2022		0	0	16,263,583	16,263,583
Ending balance at Dec. 31, 2022	$ 1,069,226	$ 0	$ 0	$ 462,404	$ 462,404	847,235	$ (303)	$ 846,932	(138,019)	$ (138,019)	(102,394)	$ (102,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 4.66
Net Income (Loss) Attributable to Parent	$ 126,734					126,734
Other Comprehensive Income (Loss), Net of Tax	36,203										36,203
Dividends, Common Stock, Cash						68,716
Allocated Share-based Compensation Expense	$ 6,800			$ 6,787
Shares Paid for Tax Withholding for Share Based Compensation	23,973
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	38,842			38,842
Stock Granted, Value, Share-based Compensation, Net of Forfeitures				$ (5,911)		(947)			(4,014)
Treasury Stock, Shares, Acquired				199,000
Treasury Stock, Value, Acquired, Cost Method									(23,017)
Treasury Stock Reissued Shares For Director Grants	13,054			13,054
Treasury shares reissued for director grants						(126)			1,349
Ending balance, shares at Dec. 31, 2023		0		16,116,479
Ending balance at Dec. 31, 2023	$ 1,145,293	$ 0		$ 463,280		$ 903,877			$ (155,673)		$ (66,191)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 4.20