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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 7,555	$ 6,837
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	1,113	817
Tax (expense) benefit	(407)	(319)
Reclassification to realized (gains) losses	235	(3)
Tax expense (benefit)	(87)	1
Postretirement Plans:
Amortization of unrecognized net actuarial (gain) loss	51	51
Tax expense (benefit)	(20)	(20)
Other comprehensive income (loss)	885	527
Comprehensive income	$ 8,440	$ 7,364

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