Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities
Net income (loss)	$ (1,356,347)	$ 151,866
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation of property, plant and equipment	204,887	200,722
Other amortization	37,123	32,744
Provision for credit losses	(3,821)	10,053
Loans originated, held for sale	(83,552)	(37,288)
Proceeds from sale of loans, held for sale	85,389	36,086
Gain on sale of loans, net	(1,151)	(701)
Deferred income tax benefit	(513,917)	(5,594)
Share-based compensation expense	3,161	8,281
Allowance for equity funds used during construction	(10,276)	(11,073)
Goodwill impairment	82,190	0
Asset impairment	39,642	0
Other	(7,660)	(5,315)
Changes in assets and liabilities
Decrease in accounts receivable and unbilled revenues, net	48,772	41,494
Decrease in fuel oil stock	38,152	38,587
Decrease (increase) in materials and supplies	440	(20,006)
Decrease (increase) in regulatory assets	(13,263)	13,908
Increase in regulatory liabilities	33,461	32,454
Increase in accounts, interest and dividends payable	46,289	70,850
Change in prepaid and accrued income taxes, tax credits and utility revenue taxes	(35,021)	(24,860)
Decrease in defined benefit pension and other postretirement benefit plans liability	(6,694)	(6,722)
Increase in wildfire tort-related claims	1,840,000	75,000
Change in other assets and liabilities	(76,893)	(125,348)
Net cash provided by (used in) operating activities	350,911	475,138
Cash flows from investing activities
Principal repayments on available-for-sale investment securities	79,742	117,042
Proceeds from repayments or maturities of held-to-maturity investment securities	53,032	52,823
Purchase of stock from Federal Home Loan Bank	(36,121)	(76,040)
Redemption of stock from Federal Home Loan Bank	21,645	84,600
Net decrease (increase) in loans held for investment	110,788	(283,126)
Proceeds from sale of commercial loans	40,186	94,665
Purchase of loans held for investment	0	(26,195)
Capital expenditures	(258,645)	(342,364)
Contributions to low income housing investments	(33,545)	(418)
Other	(1,142)	9,375
Net cash used in investing activities	(24,060)	(369,638)
Cash flows from financing activities
Net decrease in deposit liabilities	(146,568)	(43,655)
Net decrease in short-term borrowings with original maturities of three months or less	0	(137,650)
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	5,204	625,000
Repayment of long-term debt	(12,865)	(64,317)
Withheld shares for employee taxes on vested share-based compensation	(1,074)	(2,356)
Net proceeds from issuance of common stock	556,724	437
Common stock dividends	0	(112,957)
Preferred stock dividends of subsidiaries	(1,417)	(1,417)
Other	(18,149)	(9,409)
Net cash provided by (used in) financing activities	151,855	371,866
Net increase in cash, cash equivalents and restricted cash	478,706	477,366
Cash, cash equivalents and restricted cash, beginning of period	694,574	204,927
Cash, cash equivalents and restricted cash, end of period	1,173,280	682,293
Less: Restricted cash	(13,645)	(15,164)
Cash and cash equivalents	$ 1,159,635	$ 667,129