CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 152,556	$ 103,996	$ 42,318
Other comprehensive income (loss):
Change in net unrealized gain (loss) during the period	(138,630)	(28,865)	16,432
Reclassification adjustment for net gains included in net gain on sale of securities and other assets		(1,207)	(4,592)
Accretion of net unrealized loss on securities transferred to held-to-maturity	2,953
Change in pension and other postretirement obligations:
Reclassification adjustment for expense included in other expense	(3,715)	(1,092)	(1,272)
Reclassification adjustment for curtailment loss		1,543	(1,651)
Change in the net actuarial gain	(2,062)	6,563	2,817
Change in unrealized gain (loss) on derivatives:
Change in net unrealized gain (loss) during the period	14,412	5,277	(24,449)
Reclassification adjustment for loss included in loss on termination of derivatives		16,505	6,596
Reclassification adjustment for expense included in interest expense	(1,621)	940	6,127
Other comprehensive (loss) income before income taxes	(128,663)	(336)	8
Deferred tax benefit	(40,465)	(79)	(8)
Total other comprehensive (loss) income, net of tax	(88,198)	(257)	16
Total comprehensive income	$ 64,358	$ 103,739	$ 42,334