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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 45,972	$ 27,509	$ 27,034
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	639	(1,919)	(473)
Tax (expense) benefit	(234)	683	184
Reclassification to realized (gains) losses	235	(3)	1
Tax expense (benefit)	(87)	1
Postretirement plans:
Net gain (loss) arising during period	1,601	(557)	(4,321)
Tax (expense) benefit	(593)	115	1,685
Amortization of unrecognized net actuarial (gain) loss	211	202	(79)
Tax expense (benefit)	(75)	(79)	31
Other comprehensive income (loss)	1,697	(1,557)	(2,972)
Comprehensive income	$ 47,669	$ 25,952	$ 24,062

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