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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 253,372	$ 153,804	$ 225,913
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	(83,958)	43,428	22,677
Defined Benefit Plans	9,754	(4,494)	(2,746)
Other Comprehensive Income (Loss)	(74,204)	38,934	19,931
Comprehensive Income	$ 179,168	$ 192,738	$ 245,844

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