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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 22,285	$ 20,673
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	5,903	(7,290)
Tax (expense) benefit	(1,380)	1,703
Postretirement Plans:
Amortization of unrecognized net actuarial loss	228	52
Tax benefit	(54)	(12)
Other comprehensive income (loss)	4,697	(5,547)
Comprehensive income	$ 26,982	$ 15,126

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