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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jan. 01, 2014 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses | $ 620,081 | $ 775,060 | $ 1,739,619 | $ 2,185,069 |  |  |
Operating income | 97,095 | 92,036 | 239,331 | 264,433 |  |  |
Income taxes | 29,516 | 27,264 | 70,406 | 76,302 |  |  |
Net income for common stock | 50,673 | 47,808 | 117,557 | 134,876 |  |  |
Other | 453,099 |  | 453,099 |  | $ 542,523 |  |
Liabilities and Equity | 11,573,466 |  | 11,573,466 |  | 11,185,142 |  |
Liabilities | 9,618,172 |  | 9,618,172 |  | 9,360,276 |  |
Retained earnings | 315,759 |  | 315,759 |  | 296,654 |  |
Common stock equity | 1,921,001 | 1,800,457 | 1,921,001 | 1,800,457 | 1,790,573 |  | $ 1,726,406
Net income | 51,144 | 48,279 | 118,974 | 136,293 |  |  |
Increase in deferred income taxes |  |  | 2,723 | 50,296 |  |  |
Change in other assets and liabilities |  |  | (38,033) | (56,326) |  |  |
American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative effect of adoption of new accounting principle in period |  |  |  |  |  | $ 700 |
Low income housing tax credits, amortization | 1,300 |  | 3,800 |  |  |  |
Low income housing tax credits, tax credits | 1,300 |  | 3,900 |  |  |  |
Low income housing tax credits, other tax benefits | 600 |  | 1,600 |  |  |  |
Income taxes | 7,351 | 7,253 | 21,382 | 21,806 |  |  |
Other | 307,089 |  | 307,089 |  | 305,416 |  |
Liabilities and Equity | 5,855,497 |  | 5,855,497 |  | 5,566,222 |  |
Liabilities | 5,298,100 |  | 5,298,100 |  | 5,032,434 |  |
Retained earnings | 229,211 |  | 229,211 |  | 211,934 |  |
Common stock equity | 557,397 |  | 557,397 |  | 533,788 |  |
Net income | 13,451 | 13,253 | 39,777 | 39,188 |  |  |
Bank |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses | 48,289 | 43,030 | 138,063 | 126,778 |  |  |
Operating income | 20,802 | 20,506 | 61,159 | 60,993 |  |  |
Income taxes | 7,351 | 7,253 | 21,382 | 21,806 |  |  |
Net income for common stock | 13,451 | 13,253 | 39,777 | 39,188 |  |  |
Net income | $ 13,451 | 13,253 | $ 39,777 | 39,188 |  |  |
Scenario, Previously Reported |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase in deferred income taxes |  |  |  | 49,270 |  |  |
Change in other assets and liabilities |  |  |  | (47,760) |  |  |
Scenario, Previously Reported | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 6,312 |  | 18,769 |  |  |
Net income for common stock |  | 13,260 |  | 39,475 |  |  |
Other |  |  |  |  | 304,435 |  |
Liabilities and Equity |  |  |  |  | 5,565,241 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 116,527 |  |
Liabilities |  |  |  |  | 5,030,598 |  |
Retained earnings |  |  |  |  | 212,789 |  |
Common stock equity |  |  |  |  | 534,643 |  |
Scenario, Previously Reported | Bank | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 39,664 |  | 117,924 |  |  |
Operating income |  | 19,572 |  | 58,244 |  |  |
Restatement Adjustment | Capital Expenditure Accruals |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase in deferred income taxes |  |  |  | 1,026 |  |  |
Change in other assets and liabilities |  |  |  | (8,566) |  |  |
Accounting Standards Update 2014-01 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 27,264 |  | 76,302 |  |  |
Net income for common stock |  | 47,808 |  | 134,876 |  |  |
Other |  |  |  |  | 542,523 |  |
Liabilities and Equity |  |  |  |  | 11,185,142 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 633,570 |  |
Liabilities |  |  |  |  | 9,360,276 |  |
Retained earnings |  |  |  |  | 296,654 |  | 255,030
Common stock equity |  |  |  |  | 1,790,573 |  | 1,726,406
Net income |  |  |  | 136,293 |  |  |
Increase in deferred income taxes |  |  |  | 50,296 |  |  |
Change in other assets and liabilities |  |  |  | (56,326) |  |  |
Accounting Standards Update 2014-01 | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 7,253 |  | 21,806 |  |  |
Net income for common stock |  | 13,253 |  | 39,188 |  |  |
Other |  |  |  |  | 305,416 |  |
Liabilities and Equity |  |  |  |  | 5,566,222 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 118,363 |  |
Liabilities |  |  |  |  | 5,032,434 |  |
Retained earnings |  |  |  |  | 211,934 |  |
Common stock equity |  |  |  |  | 533,788 |  |
Accounting Standards Update 2014-01 | Bank |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 43,030 |  | 126,778 |  |  |
Operating income |  | 20,506 |  | 60,993 |  |  |
Accounting Standards Update 2014-01 | Bank | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 38,730 |  | 115,174 |  |  |
Operating income |  | 20,506 |  | 60,994 |  |  |
Accounting Standards Update 2014-01 | Scenario, Previously Reported |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 26,323 |  | 73,265 |  |  |
Net income for common stock |  | 47,815 |  | 135,163 |  |  |
Other |  |  |  |  | 541,542 |  |
Liabilities and Equity |  |  |  |  | 11,184,161 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 631,734 |  |
Liabilities |  |  |  |  | 9,358,440 |  |
Retained earnings |  |  |  |  | 297,509 |  | 255,694
Common stock equity |  |  |  |  | 1,791,428 |  | 1,727,070
Net income |  |  |  | 136,580 |  |  |
Increase in deferred income taxes |  |  |  | 48,900 |  |  |
Change in other assets and liabilities |  |  |  | (47,677) |  |  |
Accounting Standards Update 2014-01 | Scenario, Previously Reported | Bank |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 43,964 |  | 129,528 |  |  |
Operating income |  | 19,572 |  | 58,243 |  |  |
Accounting Standards Update 2014-01 | Restatement Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 941 |  | 3,037 |  |  |
Net income for common stock |  | (7) |  | (287) |  |  |
Other |  |  |  |  | 981 |  |
Liabilities and Equity |  |  |  |  | 981 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 1,836 |  |
Liabilities |  |  |  |  | 1,836 |  |
Retained earnings |  |  |  |  | (855) |  | (664)
Common stock equity |  |  |  |  | (855) |  | $ (664)
Net income |  |  |  | (287) |  |  |
Increase in deferred income taxes |  |  |  | 370 |  |  |
Change in other assets and liabilities |  |  |  | (83) |  |  |
Accounting Standards Update 2014-01 | Restatement Adjustment | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 941 |  | 3,037 |  |  |
Net income for common stock |  | (7) |  | (287) |  |  |
Other |  |  |  |  | 981 |  |
Liabilities and Equity |  |  |  |  | 981 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 1,836 |  |
Liabilities |  |  |  |  | 1,836 |  |
Retained earnings |  |  |  |  | (855) |  |
Common stock equity |  |  |  |  | $ (855) |  |
Accounting Standards Update 2014-01 | Restatement Adjustment | Bank |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | (934) |  | (2,750) |  |  |
Operating income |  | 934 |  | 2,750 |  |  |
Accounting Standards Update 2014-01 | Restatement Adjustment | Bank | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | (934) |  | (2,750) |  |  |
Operating income |  | $ 934 |  | $ 2,750 |  |  |

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