CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 38,395	$ 15,868	$ 68,639	$ 37,226
Other comprehensive income (loss):
Change in net unrealized gain or loss during the period	(8,654)	1,716	(15,222)	15,769
Reclassification adjustment for net gains included in net gain on securities and other assets		(215)	(1,207)	(3,357)
Change in pension and other postretirement obligations:
Reclassification adjustment for expense included in other expense	(735)	4	(1,595)	194
Reclassification adjustment for curtailment loss			1,543
Change in the net actuarial gain or loss	941	267	2,470	619
Change in unrealized gain or loss on derivatives:
Change in net unrealized gain or loss during the period	225	100	3,767	(25,098)
Reclassification adjustment for loss included in loss on termination of derivatives			16,505
Reclassification adjustment for expense included in interest expense	38	2,319	902	3,679
Other comprehensive (loss) income before income taxes	(8,185)	4,191	7,163	(8,194)
Deferred tax (benefit) expense	(2,567)	1,327	2,281	(2,595)
Total other comprehensive (loss) income, net of tax	(5,618)	2,864	4,882	(5,599)
Total comprehensive income	$ 32,777	$ 18,732	$ 73,521	$ 31,627