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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 48,862	$ 39,526	$ 33,526
Other comprehensive income (loss), net of tax:
Securities available for sale and transferred securities	9,323	(4,494)	454
Hedging derivative instruments	(242)	(276)
Pension and post-retirement obligations	470	(4,595)	1,581
Total other comprehensive income (loss), net of tax	9,551	(9,365)	2,035
Comprehensive income	$ 58,413	$ 30,161	$ 35,561

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