CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) [Abstract]
Net Income	$ 8,392	$ 11,501
Other comprehensive income (loss):
Change in holding gain or loss on securities available-for-sale	10,252	4,687
Change in pension and other postretirement obligations	271	492
Change in gain or loss on derivatives	(20,377)	(3,284)
Other comprehensive gain (loss) before income taxes	(9,854)	1,895
Deferred tax expense (benefit)	(3,162)	627
Other comprehensive income (loss), net of tax	(6,692)	1,268
Total comprehensive income	$ 1,700	$ 12,769