Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net income (loss)	$ (1,252,416)	$ 110,277
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation of property, plant and equipment	136,888	133,232
Other amortization	24,602	21,609
Provision for credit losses	(4,069)	1,218
Loans originated, held for sale	(57,381)	(14,912)
Proceeds from sale of loans, held for sale	57,259	14,596
Gain on sale of loans, net	(788)	(360)
Deferred income tax expense (benefit)	(455,510)	(1,309)
Share-based compensation expense	3,075	5,919
Allowance for equity funds used during construction	(6,976)	(7,073)
Goodwill impairment	82,190	0
Other	1,537	(3,710)
Changes in assets and liabilities
Decrease in accounts receivable and unbilled revenues, net	99,756	103,695
Decrease in fuel oil stock	1,188	47,963
Decrease (increase) in materials and supplies	1,324	(11,662)
Increase in regulatory assets	(23,425)	(10,620)
Increase in regulatory liabilities	16,716	22,782
Increase in accounts, interest and dividends payable	19,857	34,946
Change in prepaid and accrued income taxes, tax credits and utility revenue taxes	(44,470)	(45,171)
Decrease in defined benefit pension and other postretirement benefit plans liability	(4,784)	(4,304)
Increase in Wildfire tort-related claims	1,637,000	0
Change in other assets and liabilities	(38,126)	(25,499)
Net cash provided by operating activities	193,447	371,617
Cash flows from investing activities
Principal repayments on available-for-sale investment securities	52,545	68,279
Proceeds from repayments or maturities of held-to-maturity investment securities	29,417	35,604
Purchase of stock from Federal Home Loan Bank	(36,121)	(62,400)
Redemption of stock from Federal Home Loan Bank	21,645	70,960
Net decrease (increase) in loans held for investment	119,072	(208,042)
Proceeds from sale of commercial loans	31,067	66,655
Purchase of loans held for investment	0	(26,195)
Capital expenditures	(179,865)	(235,875)
Other	(4,237)	8,160
Net cash provided by (used in) investing activities	33,523	(282,854)
Cash flows from financing activities
Net decrease in deposit liabilities	(109,305)	(104,771)
Net decrease in short-term borrowings with original maturities of three months or less	0	(91,438)
Net decrease in other bank borrowings with original maturities of three months or less	0	(596,810)
Proceeds from issuance of short-term debt	0	65,000
Repayment of short-term debt	0	(100,000)
Proceeds from issuance of other bank borrowings	320,000	1,000,000
Repayment of other bank borrowings	(550,000)	(250,000)
Proceeds from issuance of long-term debt	4,673	250,000
Repayment of long-term debt	(9,888)	(62,426)
Withheld shares for employee taxes on vested share-based compensation	(1,074)	(2,356)
Common stock dividends	0	(78,893)
Preferred stock dividends of subsidiaries	(946)	(946)
Other	(8,174)	(1,662)
Net cash used in financing activities	(354,714)	25,698
Net increase (decrease) in cash, cash equivalents and restricted cash	(127,744)	114,461
Cash, cash equivalents and restricted cash, beginning of period	694,574	204,927
Cash, cash equivalents and restricted cash, end of period	566,830	319,388
Less: Restricted cash	(16,422)	(5,104)
Cash and cash equivalents	$ 550,408	$ 314,284