CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net change in unrealized gains (losses), tax (benefit) expense	$ (167,261)	$ (29,523)	$ 12,585
Reclassification adjustment for gains, tax expense	0	80	2,178
Amortization of unrealized gain on securities reclassified to held-to-maturity, tax expense	34,319	(32)	(60)
Change in unfunded pension liability related to unrealized gain (loss), prior service cost and transition obligation, tax expense (benefit)	(5)	50	(585)
Pension settlement, tax	0	0	67
Net change in cash flow hedge, tax expense	0	0	493
Amortization of unrealized gain on terminated cash flow hedges, tax benefit	(51)	119	106
Equity method investment tax expense (benefit)	67	$ 114	$ (3)
Fannie Mae (FNMA) mortgage-backed securities (MBS)
Amortization of unrealized gain on securities reclassified to held-to-maturity, tax expense	(119,800)
Securities transferred to held-to-maturity from available-for-sale, book value	$ 1,100,000