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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 29,285	$ 16,352	$ 57,479	$ 34,532
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	4,326	2,772	(19,909)	23,537
Tax (expense) benefit	(994)	(637)	4,575	(5,409)
Reclassification to realized (gains) losses	0	(8,024)	0	(8,024)
Tax expense (benefit)	0	1,844	0	1,844
Postretirement Plans:
Amortization of unrecognized net actuarial loss	205	180	376	358
Tax benefit	(77)	(42)	(117)	(83)
Other comprehensive income (loss)	3,460	(3,907)	(15,075)	12,223
Comprehensive income	$ 32,745	$ 12,445	$ 42,404	$ 46,755

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