CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net Income	$ 12,966	$ 13,035	$ 21,358	$ 24,536
Other comprehensive income (loss):
Change in unrealized holding gain (loss) on securities available-for-sale	659	4,261	10,911	8,948
Change in pension and other postretirement obligations	271	237	542	729
Change in unrealized gain (loss) on derivatives	(3,461)	(6,077)	(23,838)	(9,361)
Other comprehensive income (loss) before income taxes	(2,531)	(1,579)	(12,385)	316
Deferred tax expense (benefit)	(760)	(523)	(3,922)	104
Other comprehensive income (loss), net of tax	(1,771)	(1,056)	(8,463)	212
Total comprehensive income	$ 11,195	$ 11,979	$ 12,895	$ 24,748