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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 21,991	$ 13,086	$ 65,394	$ 31,795
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	(927)	186	(10,229)	3,288
Tax (expense) benefit	216	(69)	2,390	(1,213)
Reclassification to realized (gains) losses				235
Tax expense (benefit)				(87)
Postretirement Plans:
Amortization of unrecognized net actuarial (gain) loss	(87)	53	16	158
Tax expense (benefit)	20	(20)	(4)	(56)
Other comprehensive income (loss)	(778)	150	(7,827)	2,325
Comprehensive income	$ 21,213	$ 13,236	$ 57,567	$ 34,120

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