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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	$ 33,526	$ 31,931	$ 28,337
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale	454	(3,033)	(2,321)
Pension and post-retirement obligations	1,581	409	5
Total other comprehensive income (loss), net of tax	2,035	(2,624)	(2,316)
Comprehensive income	$ 35,561	$ 29,307	$ 26,021

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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