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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities    
Net income $ 205,039 $ 118,974
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation of property, plant and equipment 145,684 137,721
Other amortization 7,368 7,252
Provision for loan losses 15,266 5,436
Loans receivable originated and purchased, held for sale (172,657) (226,081)
Proceeds from sale of loans receivable, held for sale 168,490 231,509
Deferred income taxes 30,667 2,723
Share-based compensation expense 3,581 4,780
Excess tax benefits from share-based payment arrangements (398) (1,012)
Allowance for equity funds used during construction (6,010) (5,366)
Impairment of utility assets 0 4,828
Other 3,234 3,921
Changes in assets and liabilities    
Decrease (increase) in accounts receivable and unbilled revenues, net (12,104) 8,248
Decrease in fuel oil stock 6,736 35,942
Increase in regulatory assets (2,251) (23,458)
Increase (decrease) in accounts, interest and dividends payable 3,399 (34,171)
Change in prepaid and accrued income taxes and utility revenue taxes 52,558 (8,458)
Increase in defined benefit pension and other postretirement benefit plans liability 150 418
Change in other assets and liabilities (39,850) (41,954)
Net cash provided by operating activities 408,902 221,252
Cash flows from investing activities    
Available-for-sale investment securities purchased (354,165) (326,965)
Principal repayments on available-for-sale investment securities 172,829 96,053
Proceeds from sale of available-for-sale investment securities 16,423 0
Purchase of stock from Federal Home Loan Bank (2,773) (1,600)
Redemption of stock from Federal Home Loan Bank 2,233 60,223
Net increase in loans held for investment (175,303) (101,771)
Proceeds from sale of commercial loans 37,946 0
Proceeds from sale of real estate acquired in settlement of loans 829 1,258
Proceeds from sale of real estate held-for-sale 1,764 7,280
Capital expenditures (259,207) (276,186)
Contributions in aid of construction 23,568 34,627
Other 112 4,084
Net cash used in investing activities (535,744) (502,997)
Cash flows from financing activities    
Net increase in deposit liabilities 355,467 202,539
Net increase (decrease) in short-term borrowings with original maturities of three months or less (103,063) 53,020
Net increase (decrease) in retail repurchase agreements (21,121) 67,934
Proceeds from other bank borrowings 55,835 50,000
Repayments of other bank borrowings (97,902) (40,000)
Proceeds from issuance of long-term debt 75,000 0
Repayment of long-term debt (75,000) 0
Excess tax benefits from share-based payment arrangements 398 1,012
Net proceeds from issuance of common stock 10,901 104,437
Common stock dividends (83,620) (98,452)
Preferred stock dividends of subsidiaries (1,417) (1,417)
Other (4,759) (4,453)
Net cash provided by financing activities 110,719 334,620
Net increase (decrease) in cash and cash equivalents (16,123) 52,875
Cash and cash equivalents, beginning of period 300,478 175,542
Cash and cash equivalents, end of period $ 284,355 $ 228,417