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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    
Liabilities 9,506,818   9,506,818   9,360,276    
Retained earnings 298,398   298,398   296,654    
Common stock equity 1,898,520 1,759,935 1,898,520 1,759,935 1,790,573   $ 1,726,406
Net income 35,491 41,754 67,830 [1] 88,014 [1]      
Increase (decrease) in deferred income taxes [1]     (4,463) 44,494      
Change in other assets and liabilities [1]     (24,455) (38,540)      
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      
Other 305,310   305,310   305,416    
Liabilities and Equity 5,777,098   5,777,098   5,566,222    
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    
Net income 12,851 11,536 26,326 25,935      
Scenario, Previously Reported              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Increase (decrease) in deferred income taxes     22,980 28,570      
Change in other assets and liabilities     (47,146) (16,909)      
Restatement Adjustment | Capital Expenditure Accruals              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Increase (decrease) in deferred income taxes       15,924      
Change in other assets and liabilities       (21,631)      
Accounting Standards Update 2014-01              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Income taxes   23,317   49,038      
Net income for common stock   41,281   87,068      
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       88,014      
Increase (decrease) in deferred income taxes       44,494      
Change in other assets and liabilities       (38,540)      
Accounting Standards Update 2014-01 | American Savings Bank (ASB)              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Income taxes   6,420   14,553      
Net income for common stock   11,536   25,935      
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 | 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
Net income       88,294      
Increase (decrease) in deferred income taxes       28,252      
Change in other assets and liabilities       (16,871)      
Accounting Standards Update 2014-01 | 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)
Net income       (280)      
Increase (decrease) in deferred income taxes       318      
Change in other assets and liabilities       (38)      
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      
Net income $ 12,851 11,536 $ 26,326 25,935      
Bank | Accounting Standards Update 2014-01              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total expenses   42,660   83,748      
Operating income   17,956   40,487      
Bank | Accounting Standards Update 2014-01 | 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 | Accounting Standards Update 2014-01 | 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 | Accounting Standards Update 2014-01 | 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      
[1] As restated - See Note 1, “Basis of presentation - Restatement of previously issued financial statements.”