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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 16,352	$ 23,859	$ 34,532	$ 46,144
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	2,772	11,701	23,537	17,604
Tax (expense) benefit	(637)	(2,714)	(5,409)	(4,094)
Reclassification to realized (gains) losses	(8,024)	0	(8,024)	0
Tax expense (benefit)	1,844	0	1,844	0
Postretirement Plans:
Amortization of unrecognized net actuarial loss	180	228	358	456
Tax benefit	(42)	(63)	(83)	(117)
Other comprehensive income (loss)	(3,907)	9,152	12,223	13,849
Comprehensive income	$ 12,445	$ 33,011	$ 46,755	$ 59,993

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