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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Jan. 01, 2014 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses | $ 551,182 | $ 715,474 | $ 1,119,538 | $ 1,410,009 |  |  |
Operating income | 72,730 | 83,183 | 142,236 | 172,397 |  |  |
Income taxes | 20,911 | 23,317 | 40,890 | 49,038 |  |  |
Net income for common stock | 35,018 | 41,281 | 66,884 | 87,068 |  |  |
Other | 493,151 |  | 493,151 |  | $ 542,523 |  |
Liabilities and Equity | 11,439,631 |  | 11,439,631 |  | 11,185,142 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 633,570 |  |
Liabilities | 9,506,818 |  | 9,506,818 |  | 9,360,276 |  |
Retained earnings | 298,398 |  | 298,398 |  | 296,654 |  | $ 255,030
Common stock equity | 1,898,520 | 1,759,935 | 1,898,520 | 1,759,935 | 1,790,573 |  | 1,726,406
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 | 1,200 |  | 2,500 |  |  |  |
Low income housing tax credits, tax credits | 1,200 |  | 2,600 |  |  |  |
Low income housing tax credits, other tax benefits | 500 |  | 1,100 |  |  |  |
Income taxes | 6,875 | 6,420 | 14,031 | 14,553 |  |  |
Net income for common stock |  | 11,536 |  | 25,935 |  |  |
Other | 305,310 |  | 305,310 |  | 305,416 |  |
Liabilities and Equity | 5,777,098 |  | 5,777,098 |  | 5,566,222 |  |
Deferred Income Tax Liabilities And Other Liabilities |  |  |  |  | 118,363 |  |
Liabilities | 5,230,443 |  | 5,230,443 |  | 5,032,434 |  |
Retained earnings | 223,260 |  | 223,260 |  | 211,934 |  |
Common stock equity | 546,655 |  | 546,655 |  | 533,788 |  |
Scenario, Previously Reported |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 22,269 |  | 46,942 |  |  |
Net income for common stock |  | 41,421 |  | 87,348 |  |  |
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
Scenario, Previously Reported | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 5,372 |  | 12,457 |  |  |
Net income for common stock |  | 11,676 |  | 26,215 |  |  |
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 |  |
Accounting Standards Update 2014-01 | Restatement Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 1,048 |  | 2,096 |  |  |
Net income for common stock |  | (140) |  | (280) |  |  |
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)
Accounting Standards Update 2014-01 | Restatement Adjustment | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Income taxes |  | 1,048 |  | 2,096 |  |  |
Net income for common stock |  | (140) |  | (280) |  |  |
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) |  |
Bank |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses | 46,057 | 42,660 | 89,774 | 83,748 |  |  |
Operating income | 19,726 | 17,956 | 40,357 | 40,487 |  |  |
Income taxes | 6,875 | 6,420 | 14,031 | 14,553 |  |  |
Net income for common stock | $ 12,851 | 11,536 | $ 26,326 | 25,935 |  |  |
Bank | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 38,982 |  | 76,444 |  |  |
Operating income |  | 17,956 |  | 40,488 |  |  |
Bank | Scenario, Previously Reported |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 43,568 |  | 85,564 |  |  |
Operating income |  | 17,048 |  | 38,671 |  |  |
Bank | Scenario, Previously Reported | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | 39,890 |  | 78,260 |  |  |
Operating income |  | 17,048 |  | 38,672 |  |  |
Bank | Accounting Standards Update 2014-01 | Restatement Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | (908) |  | (1,816) |  |  |
Operating income |  | 908 |  | 1,816 |  |  |
Bank | Accounting Standards Update 2014-01 | Restatement Adjustment | American Savings Bank (ASB) |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total expenses |  | (908) |  | (1,816) |  |  |
Operating income |  | $ 908 |  | $ 1,816 |  |  |

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