Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$ 32,339us-gaap_ProfitLoss	$ 46,260us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of property, plant and equipment	45,865us-gaap_Depreciation	43,181us-gaap_Depreciation
Other amortization	1,362us-gaap_AdjustmentForAmortization	1,609us-gaap_AdjustmentForAmortization
Provision for loan losses	614us-gaap_ProvisionForLoanAndLeaseLosses	995us-gaap_ProvisionForLoanAndLeaseLosses
Loans receivable originated and purchased, held for sale	(79,070)	(46,998)
Proceeds from sale of loans receivable, held for sale	78,332	48,720
Increase in deferred income taxes	15,265us-gaap_DeferredIncomeTaxExpenseBenefit	6,457us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from share-based payment arrangements	(968)	(164)
Allowance for equity funds used during construction	(1,413)	(1,609)
Change in cash overdraft	0	(1,038)
Changes in assets and liabilities
Decrease in accounts receivable and unbilled revenues, net	58,331us-gaap_IncreaseDecreaseInReceivables	22,352us-gaap_IncreaseDecreaseInReceivables
Decrease (increase) in fuel oil stock	20,731	(34,260)
Increase in regulatory assets	(10,827)	(9,258)
Decrease in accounts, interest and dividends payable	(42,463)	(9,307)
Change in prepaid and accrued income taxes and utility revenue taxes	(61,397)	(19,474)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability	123	(818)
Change in other assets and liabilities	19,826	(27,227)
Net cash provided by operating activities	76,650	19,421
Cash flows from investing activities
Available-for-sale investment securities purchased	(63,370)	(79,912)
Principal repayments on available-for-sale investment securities	28,486	15,597
Proceeds from sale of available-for-sale investment securities	0	79,564
Redemption of stock from Federal Home Loan Bank of Seattle	5,590	5,848
Net increase in loans held for investment	(12,524)	(37,887)
Proceeds from sale of real estate acquired in settlement of loans	606	1,429
Capital expenditures	(59,011)	(65,829)
Contributions in aid of construction	9,145	6,958
Other	3,281	0
Net cash used in investing activities	(87,797)	(74,232)
Cash flows from financing activities
Net increase in deposit liabilities	127,913us-gaap_IncreaseDecreaseInDeposits	105,510us-gaap_IncreaseDecreaseInDeposits
Net increase (decrease) in short-term borrowings with original maturities of three months or less	(88,472)	30,887
Net increase in retail repurchase agreements	21,451	141
Excess tax benefits from share-based payment arrangements	968	164
Net proceeds from issuance of common stock	104,468us-gaap_ProceedsFromRepurchaseOfEquity	3,054us-gaap_ProceedsFromRepurchaseOfEquity
Common stock dividends	(31,829)us-gaap_PaymentsOfDividendsCommonStock	(31,435)us-gaap_PaymentsOfDividendsCommonStock
Preferred stock dividends of subsidiaries	(473)	(473)
Other	(6,253)	(3,953)
Net cash provided by financing activities	127,773	103,895
Net increase in cash and cash equivalents	116,626	49,084
Cash and cash equivalents, beginning of period	175,542	220,036
Cash and cash equivalents, end of period	$ 292,168	$ 269,120

The increase (decrease) during the reporting period in accounts, interest and dividends payable.

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The increase (decrease) during the reporting period in the amount due to fund defined benefit pension and other postretirement benefit plans liability.

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The net changes in cash flows resulting from changes in prepaid and accrued income taxes and utility revenue taxes.

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The decrease in retail repurchase agreements, during the period.

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The net cash inflow (outflow) resulting from principal repayments on investment and mortgage-related securities.

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

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The change in cash during the period due to the net increase or decrease in outstanding checks, the liability that represents checks that have been issued but that have not cleared. The entity may classify these cash flows as financing or operating activities. Another element, Increase (Decrease) in Outstanding Checks, Financing Activities, represents cash flows from outstanding checks classified as financing activities.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.

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