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	$ 28,337	$ 29,355	$ 25,530
Other comprehensive (loss) income, net of tax:
Net unrealized (losses) gains on securities available for sale	(2,321)	6,962	(21,397)
Pension and post-retirement obligations	5	(5,786)	7,957
Total other comprehensive (loss) income, net of tax	(2,316)	1,176	(13,440)
Comprehensive income	$ 26,021	$ 30,531	$ 12,090