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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 67,533	$ 38,908	$ 127,482	$ 73,650
Other Comprehensive Income (Loss), Net of Tax:
Net Unrealized Gains (Losses) on Investment Securities	(123)	7,730	(50,173)	49,289
Defined Benefit Plans	442	374	883	748
Total Other Comprehensive Income (Loss)	319	8,104	(49,290)	50,037
Comprehensive Income	$ 67,852	$ 47,012	$ 78,192	$ 123,687

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