CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net Income	$ 13,035	$ 12,321	$ 24,536	$ 27,066
Other comprehensive income (loss):
Change in unrealized holding gain (loss) on securities available-for-sale	4,261	(1,679)	8,948	(4,237)
Change in pension and other postretirement obligations	237	286	729	441
Change in unrealized gain (loss) on derivatives	(6,077)	560	(9,361)	2,576
Other comprehensive income (loss) before income taxes	(1,579)	(833)	316	(1,220)
Deferred tax expense (benefit)	(523)	(292)	104	(404)
Other comprehensive income (loss), net of tax	(1,056)	(541)	212	(816)
Total comprehensive income	$ 11,979	$ 11,780	$ 24,748	$ 26,250