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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 39,526	$ 33,526	$ 31,931
Other comprehensive income (loss), net of tax:
Securities available for sale and transferred securities	(4,494)	454	(3,033)
Hedging derivative instruments	(276)
Pension and post-retirement obligations	(4,595)	1,581	409
Total other comprehensive income (loss), net of tax	(9,365)	2,035	(2,624)
Comprehensive income	$ 30,161	$ 35,561	$ 29,307

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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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