Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 667,129	$ 199,877
Restricted cash	15,164	5,050
Accounts receivable and unbilled revenues, net	540,082	511,903
Available-for-sale investment securities, at fair value	1,266,412	1,429,667
Held-to-maturity investment securities, at amortized cost	1,212,005	1,251,747
Stock in Federal Home Loan Bank, at cost	18,000	26,560
Loans held for investment, net	6,114,640	5,906,690
Loans held for sale, at lower of cost or fair value	2,171	824
Property, plant and equipment, net of accumulated depreciation of $3,341,082 and $3,192,545 at September 30, 2023 and December 31, 2022, respectively	5,917,342	5,687,003
Operating lease right-of-use assets	99,466	115,684
Regulatory assets	231,197	242,513
Other	826,020	824,536
Goodwill	82,190	82,190
Total assets	16,991,818	16,284,244
Liabilities
Accounts payable	256,323	251,460
Interest and dividends payable	57,901	21,333
Deposit liabilities	8,224,351	8,169,696
Short-term borrowings—other than bank	0	172,568
Other bank borrowings	750,000	695,120
Long-term debt, net—other than bank	2,944,589	2,384,980
Deferred income taxes	258,942	262,462
Operating lease liabilities	108,681	126,604
Finance lease liabilities	122,320	48,709
Regulatory liabilities	1,101,773	1,055,650
Defined benefit pension and other postretirement benefit plans liability	70,785	71,813
Other	837,506	787,057
Total liabilities	14,733,171	14,047,452
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies (Notes 2, 4 and 5)
Shareholders’ equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 110,086,035 shares and 109,470,795 shares at September 30, 2023 and December 31, 2022, respectively	1,704,447	1,692,697
Retained earnings	877,931	845,830
Accumulated other comprehensive loss, net of tax benefits	(358,024)	(336,028)
Total shareholders’ equity	2,224,354	2,202,499
Total liabilities and shareholders’ equity	$ 16,991,818	$ 16,284,244