Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 159,672	$ 305,551
Restricted cash	5,386	5,911
Accounts receivable and unbilled revenues, net	457,470	344,213
Available-for-sale investment securities, at fair value	2,444,267	2,574,618
Held-to-maturity investment securities, at amortized cost	513,767	522,270
Stock in Federal Home Loan Bank, at cost	13,200	10,000
Loans held for investment, net	5,357,539	5,139,984
Loans held for sale, at lower of cost or fair value	3,738	10,404
Property, plant and equipment, net of accumulated depreciation	5,429,420	5,392,068
Operating lease right-of-use assets	120,600	122,416
Regulatory assets	530,900	565,543
Other	883,594	747,469
Goodwill	82,190	82,190
Total assets	16,001,743	15,822,637
Liabilities
Accounts payable	244,239	205,544
Interest and dividends payable	20,661	19,889
Deposit liabilities	8,253,536	8,172,212
Short-term borrowings—other than bank	124,017	53,998
Other bank borrowings	241,610	88,305
Long-term debt, net—other than bank	2,374,500	2,321,937
Deferred income taxes	302,346	384,760
Operating lease liabilities	136,445	136,760
Regulatory liabilities	1,008,075	996,768
Defined benefit pension and other postretirement benefit plans liability	341,535	348,072
Other	686,982	669,215
Total liabilities	13,733,946	13,397,460
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies (Notes 3 and 4)
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: 109,466,829 shares and 109,311,785 shares at June 30, 2022 and December 31, 2021, respectively	1,688,009	1,685,496
Retained earnings	803,027	757,921
Accumulated other comprehensive loss, net of tax benefits	(257,532)	(52,533)
Total shareholders’ equity	2,233,504	2,390,884
Total liabilities and shareholders’ equity	$ 16,001,743	$ 15,822,637