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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 62,053	$ 37,840	$ 189,535	$ 111,490
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	(7,541)	(4,900)	(57,714)	44,389
Defined Benefit Plans	441	374	1,324	1,122
Total Other Comprehensive Income (Loss)	(7,100)	(4,526)	(56,390)	45,511
Comprehensive Income	$ 54,953	$ 33,314	$ 133,145	$ 157,001

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