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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 27,509	$ 27,034	$ 24,996
Unrealized gains (losses) on securities available for sale:
Unrealized holding gains (losses) arising during the period, pretax	(1,919)	(473)	2,115
Tax (expense) benefit	683	184	(825)
Reclassification to realized (gains) losses	(3)	1	(786)
Tax expense (benefit)	1		307
Postretirement plans:
Net gain (loss) arising during period	(557)	(4,321)	(5,171)
Tax (expense) benefit	115	1,685	2,017
Amortization of unrecognized net actuarial (gain) loss	202	(79)	(221)
Tax expense (benefit)	(79)	31	86
Other comprehensive income (loss)	(1,557)	(2,972)	(2,478)
Comprehensive income	$ 25,952	$ 24,062	$ 22,518

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