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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 192,113	$ 242,260	$ 122,044
Debt securities available-for-sale:
Net change in unrealized (losses) gains on debt securities available-for-sale	(339,422)	(67,652)	39,880
Related income tax benefit (expense)	82,253	16,112	(9,727)
Net securities losses (gains) reclassified into earnings	13	(56)	(2,540)
Related income tax (benefit) expense	(3)	13	604
Net effect on other comprehensive income for the period	(257,159)	(51,583)	28,217
Debt securities held-to-maturity:
Amortization of unrealized gain transferred from debt securities available-for-sale			(32)
Related income tax expense			7
Net effect on other comprehensive income for the period			(25)
Defined benefit plans:
Amortization of net loss and prior service costs	291	2,521	3,000
Related income tax benefit	(70)	(609)	(714)
Recognition of unrealized (loss) gain	(473)	17,386	(420)
Related income tax benefit (expense)	115	(4,194)	100
Net effect on other comprehensive income for the period	(137)	15,104	1,966
Total other comprehensive (loss) gain	(257,296)	(36,479)	30,158
Comprehensive (loss) income	$ (65,183)	$ 205,781	$ 152,202

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