CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Unrealized gains (losses)	$ (40,270)	$ (63,954)	$ (36,278)	$ (178,061)
Amortization of unrealized (gains) losses on securities reclassified to held-to-maturity, tax (benefit) expense	(1,379)	(1,884)	(4,080)	35,955
Change in unfunded pension liability related to unrealized loss, prior service cost and transition obligation, tax benefit	(16)	(10)	(44)	(27)
Reclassification adjustment related to derivatives, tax expense	(508)	0	(869)	0
Amortization of unrealized gain on terminated cash flow hedges, tax benefit	(9)	(13)	(34)	(38)
Equity method investment tax benefit	$ 61	$ 8	$ 28	67
Fannie Mae (FNMA) mortgage-backed securities (MBS)
Amortization of unrealized (gains) losses on securities reclassified to held-to-maturity, tax (benefit) expense				119,800
Securities transferred to held-to-maturity from available-for-sale, book value				$ 1,100,000