CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 103,996	$ 42,318	$ 36,186
Other comprehensive income (loss):
Change in net unrealized gain or loss during the period	(28,865)	16,432	9,693
Reclassification adjustment for net gains included in net gain on securities and other assets	(1,207)	(4,592)	(31)
Change in pension and other postretirement obligations:
Reclassification adjustment for expense included in other expense	(1,092)	(1,272)	729
Reclassification adjustment for curtailment loss (gain)	1,543	(1,651)
Change in the net actuarial gain or loss	6,563	2,817	(296)
Change in unrealized gain or loss on derivatives:
Change in net unrealized gain or loss during the period	5,277	(24,449)	(8,254)
Reclassification adjustment for loss included in loss on termination of derivatives	16,505	6,596
Reclassification adjustment for expense included in interest expense	940	6,127	(955)
Other comprehensive (loss) income before income taxes	(336)	8	886
Deferred tax (benefit) expense	(79)	(8)	326
Total other comprehensive (loss) income, net of tax	(257)	16	560
Total comprehensive income	$ 103,739	$ 42,334	$ 36,746