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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 27,034	$ 24,996	$ 20,699
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	(473)	2,115	(4,779)
Tax (expense) benefit	184	(825)	1,865
Reclassification to realized (gains) losses	$ 1	(786)	(532)
Tax expense (benefit)		307	207
Postretirement plans:
Net gain (loss) arising during period	$ (4,321)	(5,171)	8,765
Tax (expense) benefit	1,685	2,017	(3,419)
Amortization of unrecognized net actuarial (gain) loss	(79)	(221)	(51)
Tax expense (benefit)	31	86	20
Other comprehensive income (loss)	(2,972)	(2,478)	2,076
Comprehensive income	$ 24,062	$ 22,518	$ 22,775

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