Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities
Net income	$ 136,580	$ 123,920
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of property, plant and equipment	129,574	120,355
Other amortization	5,454	2,352
Provision for loan losses	3,566	953
Loans receivable originated and purchased, held for sale	(102,523)	(199,772)
Proceeds from sale of loans receivable, held for sale	106,918	223,221
Gain on sale of credit card portfolio	0	(2,251)
Increase in deferred income taxes	48,900	60,580
Excess tax benefits from share-based payment arrangements	(271)	(469)
Allowance for equity funds used during construction	(4,933)	(4,030)
Change in cash overdraft	(1,038)	0
Changes in assets and liabilities
Decrease (increase) in accounts receivable and unbilled revenues, net	(18,943)	12,740
Decrease in fuel oil stock	15,784	24,332
Increase in regulatory assets	(17,531)	(53,314)
Decrease in accounts, interest and dividends payable	(75,812)	(21,708)
Change in prepaid and accrued income taxes and utility revenue taxes	(2,044)	(19,212)
Decrease in defined benefit pension and other postretirement benefit plans liability	(2,594)	(509)
Change in other assets and liabilities	(47,677)	(20,462)
Net cash provided by operating activities	173,410	246,726
Cash flows from investing activities
Available-for-sale investment and mortgage-related securities purchased	(130,578)	(39,721)
Principal repayments on available-for-sale investment and mortgage-related securities	52,678	84,487
Proceeds from sale of available-for-sale investment securities	79,564	71,367
Redemption of stock from Federal Home Loan Bank of Seattle	17,482	2,609
Net increase in loans held for investment	(184,766)	(293,996)
Proceeds from sale of real estate acquired in settlement of loans	2,930	8,777
Capital expenditures	(236,003)	(247,392)
Contributions in aid of construction	21,740	23,633
Proceeds from sale of credit card portfolio	0	26,386
Other	(39)	426
Net cash used in investing activities	(376,992)	(363,424)
Cash flows from financing activities
Net increase in deposit liabilities	161,320	80,926
Net increase in short-term borrowings with original maturities of three months or less	45,094	47,648
Net decrease in retail repurchase agreements	(6,306)	(6,314)
Proceeds from other bank borrowings	90,000	120,000
Repayments of other bank borrowings	(65,000)	(70,000)
Proceeds from issuance of long-term debt	125,000	50,000
Repayment of long-term debt	(100,000)	(50,000)
Excess tax benefits from share-based payment arrangements	271	469
Net proceeds from issuance of common stock	26,910	18,383
Common stock dividends	(94,674)	(73,584)
Preferred stock dividends of subsidiaries	(1,417)	(1,417)
Other	(5,097)	(4,033)
Net cash provided by financing activities	176,101	112,078
Net decrease in cash and cash equivalents	(27,481)	(4,620)
Cash and cash equivalents, beginning of period	220,036	219,662
Cash and cash equivalents, end of period	$ 192,555	$ 215,042