CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
Net income	$ 51,278	$ 12,966	$ 30,244	$ 21,358
Other comprehensive income (loss):
Change in net unrealized gain or loss during the period	8,966	3,793	(6,568)	14,053
Reclassification adjustment for net gains included in net gain on securities and other assets	(20)	(3,134)	(1,207)	(3,142)
Change in pension and other postretirement obligations:
Reclassification adjustment for expense included in other expense	(438)	95	(860)	190
Reclassification adjustment for curtailment loss			1,543
Change in the net actuarial gain or loss	644	176	1,529	352
Change in unrealized gain or loss on derivatives:
Change in net unrealized gain or loss during the period	(1,406)	(4,617)	3,542	(25,198)
Reclassification adjustment for loss included in loss on termination of derivatives			16,505
Reclassification adjustment for expense included in interest expense	10	1,156	864	1,360
Other comprehensive income (loss) before income taxes	7,756	(2,531)	15,348	(12,385)
Deferred tax expense (benefit)	3,711	(760)	4,848	(3,922)
Total other comprehensive income	4,045	(1,771)	10,500	(8,463)
Total comprehensive income	$ 55,323	$ 11,195	$ 40,744	$ 12,895