Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock [Member]	AOCI Attributable to Parent [Member]
Beginning balance at Dec. 31, 2019				$ 0	$ 459,389	$ 646,847			$ (127,633)	$ (9,589)
Beginning balance, shares at Dec. 31, 2019				0	16,346,442
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	$ 127,923					127,923
Other Comprehensive Income (Loss), Net of Tax	15,160									15,160
Dividends, Common Stock, Cash						70,601
Stock Issued During Period, Shares, Dividend Reinvestment Plan					36
Stock Issued During Period, Value, Dividend Reinvestment Plan					$ 3
Allocated Share-based Compensation Expense	$ 6,000				$ 5,998
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					30,341
Stock Granted, Value, Share-based Compensation, Net of Forfeitures					$ (4,697)	(664)			(3,031)
Treasury Stock, Shares, Acquired					76,000
Treasury Stock, Value, Acquired, Cost Method									(7,507)
Treasury Stock Reissued Shares For Director Grants	13,450				13,450
Treasury shares reissued for director grants						69			1,343
Ending balance, shares at Dec. 31, 2020				0	16,314,197
Ending balance at Dec. 31, 2020	$ 1,040,256	$ (7,956)	$ 1,032,300	$ 0	$ 460,687	704,764			(130,766)	5,571
Ending balance (Accounting Standards Update 2016-13) at Dec. 31, 2020							$ (7,956)	$ 696,808
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 4.28
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
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					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	$ 1,110,759	$ (8,000)		$ 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
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					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	16,263,583
Ending balance at Dec. 31, 2022	$ 1,069,226			$ 0	$ 462,404	$ 847,235			$ (138,019)	$ (102,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Dividends, Per Share, Cash Paid	$ 4.66