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Summary of significant accounting policies (Details 3) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Electric utility | Dec. 31, 2010 Electric utility | Dec. 31, 2009 Electric utility | Dec. 31, 2011 Electric utility Minimum Y | Dec. 31, 2011 Electric utility Maximum Y | Dec. 31, 2008 Bank | Dec. 31, 2011 Bank M D | Sep. 30, 2011 Bank | Dec. 31, 2010 Bank | Dec. 31, 2011 Bank Minimum D | Dec. 31, 2011 Bank Maximum D | Dec. 31, 2010 Stock appreciation rights (SARs) Common stock.
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.24 | $ 1.24 |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (losses) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.21 | $ (0.02) | $ (0.33) |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, basic (in dollars per share) | $ 0.36 | $ 0.50 | $ 0.28 | $ 0.30 | $ 0.26 | $ 0.35 | $ 0.31 | $ 0.29 | $ 1.45 | $ 1.22 | $ 0.91 |  |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.24 | $ 1.24 |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (losses) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.20 | $ (0.03) | $ (0.33) |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, diluted (in dollars per share) | $ 0.36 | $ 0.50 | $ 0.28 | $ 0.30 | $ 0.26 | $ 0.35 | $ 0.31 | $ 0.29 | $ 1.44 | $ 1.21 | $ 0.91 |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000
Contributions in aid of construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions amortized period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 51 |  |  |  |  |  |  |
Electric utility revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue taxes included in "operating revenues" and in "taxes, other than income taxes" expense |  |  |  |  |  |  |  |  |  |  |  | $ 264,000,000 | $ 211,000,000 | $ 181,000,000 |  |  |  |  |  |  |  |  |
Weighted average AFUDC rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 8.00% | 8.10% | 8.10% |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Past due period after which the accrual of interest on loans ceases (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 |  |  |  |  |
Past due unsecured consumer loans, period to reach delinquency status (in days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 | 180 |
Loans modified in a troubled debt restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive months of repayment required for loans to be removed from nonaccrual status |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |
Real estate acquired in settlement of loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate acquired in settlement of loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |  | 4,300,000 |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 |  |  |  | 82,190,000 |  |  |  | 82,190,000 | 82,190,000 |  |  |  |  |  |  |  | 82,200,000 |  | 82,200,000 |  |  |
Goodwill written off related to sale of business of Bishop Insurance Agency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Estimated fair value in excess of book value (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |
Probability threshold for goodwill impairment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |

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