Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 169,208	$ 261,881
Accounts receivable and unbilled revenues, net	325,672	263,209
Available-for-sale investment securities, at fair value	1,388,533	1,401,198
Held-to-maturity investment securities, at amortized cost	141,875	44,515
Stock in Federal Home Loan Bank, at cost	9,958	9,706
Loans held for investment, net	4,790,902	4,617,131
Loans held for sale, at lower of cost or fair value	1,805	11,250
Property, plant and equipment, net
Land	102,925	102,588
Plant and equipment	7,118,709	6,598,751
Construction in progress	267,714	312,204
Property, plant and equipment, gross	7,489,348	7,013,543
Less – accumulated depreciation	(2,659,230)	(2,553,295)
Total property, plant and equipment, net	4,830,118	4,460,248
Regulatory assets	833,426	869,297
Other	530,364	513,535
Goodwill	82,190	82,190
Total assets	13,104,051	12,534,160
Liabilities
Accounts payable	214,773	193,714
Interest and dividends payable	28,254	25,837
Deposit liabilities	6,158,852	5,890,597
Short-term borrowings—other than bank	73,992	117,945
Other bank borrowings	110,040	190,859
Long-term debt, net—other than bank	1,879,641	1,683,797
Deferred income taxes	372,518	388,430
Regulatory liabilities	950,236	880,770
Defined benefit pension and other postretirement benefit plans liability	538,384	509,514
Other	580,788	521,018
Total liabilities	10,907,478	10,402,481
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies
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: 108,879,245 shares and 108,787,807 shares at December 31, 2018 and 2017, respectively	1,669,267	1,662,491
Retained earnings	543,623	476,836
Accumulated other comprehensive loss, net of tax benefits
Net unrealized losses on securities	(24,423)	(14,951)
Unrealized losses on derivatives	(436)	0
Retirement benefit plans	(25,751)	(26,990)
Accumulated other comprehensive loss, net of tax benefits	(50,610)	(41,941)
Total shareholders’ equity	2,162,280	2,097,386
Total capitalization and liabilities	$ 13,104,051	$ 12,534,160