CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Pension and other post retirement obligations:
Amortization of actuarial (gains) losses included in net periodic pension cost, gross	$ (549)	$ 220	$ (1,098)	$ 440
Tax effect	133	(53)	267	(107)
Amortization of actuarial (gains) losses included in net periodic pension cost, net	(416)	167	(831)	333
Amortization of prior service cost included in net periodic pension cost, gross	160	109	320	218
Tax effect	(39)	(27)	(78)	(53)
Amortization of prior service cost included in net periodic pension cost, net	121	82	242	165
Other comprehensive (loss) income related to pension and other post-retirement obligations, net of taxes	(295)	249	(589)	498
Unrealized (losses) gains on investment securities:
Net unrealized holding (losses) gains on investment securities, gross	(44,039)	(260,180)	47,221	(618,939)
Tax effect	10,717	63,198	(11,510)	150,341
Net unrealized holding (losses) gains on investment securities, net	(33,322)	(196,982)	35,711	(468,598)
Reclassification adjustment for net losses included in net income, gross	0	0	52,329	0
Tax effect	0	0	(12,714)	0
Reclassification adjustment for net losses included in net income, net	0	0	39,615	0
Other comprehensive (loss) gain related to unrealized (losses) gains on investment securities, net of taxes	(33,322)	(196,982)	75,326	(468,598)
Other comprehensive (loss) income, net of taxes	(33,617)	(196,733)	74,737	(468,100)
Net income	48,291	39,805	54,089	86,860
Comprehensive income (loss)	14,674	$ (156,928)	128,826	$ (381,240)
Accumulated Other Comprehensive Loss By Component:
Unrealized loss for pension and other post-retirement obligations	(42,311)		(42,311)		$ (41,533)
Tax effect	10,421		10,421		10,232
Net unrealized loss for pension and other post-retirement obligations	(31,890)		(31,890)		(31,301)
Unrealized loss on investment securities	(765,233)		(765,233)		(864,783)
Tax effect	185,421		185,421		209,645
Net unrealized loss on investment securities	(579,812)		(579,812)		(655,138)
Accumulated other comprehensive loss	$ (611,702)		$ (611,702)		$ (686,439)