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Summary of significant accounting policies (Details 5) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                 $ 2,280,429 $ 2,906,942 $ 2,920,962  
Operating income $ 83,222 $ 97,095 $ 72,730 $ 69,506 $ 68,167 $ 92,036 $ 83,183 $ 89,214 322,553 332,600 317,508  
Income taxes (benefit)                 93,021 95,579 86,237  
Net income for common stock 42,320 50,673 35,018 31,866 33,253 47,808 41,281 45,787 159,877 168,129 161,709  
Other assets 488,635       542,523       488,635 542,523    
Assets 11,790,196       11,185,142       11,790,196 11,185,142 10,340,906  
Total capitalization and liabilities 11,790,196       11,185,142       11,790,196 11,185,142    
Deferred income taxes         633,570         633,570    
Total liabilities 9,828,263       9,360,276       9,828,263 9,360,276    
Retained earnings 324,766       296,654       324,766 296,654 255,030 $ 215,947
Total shareholders’ equity 1,927,640       1,790,573       1,927,640 1,790,573 1,726,406 1,593,008
Net income 42,793 $ 51,144 $ 35,491 $ 32,339 33,726 $ 48,279 $ 41,754 $ 46,260 161,767 170,019 163,599  
Increase in deferred income taxes                 41,433 104,226 80,145  
Change in other assets and liabilities                 (41,071) (101,196) (14,292)  
Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                 183,921 173,202 169,001  
Operating income                 83,812 79,295 89,146  
Income taxes (benefit)                 29,082 27,994 31,421  
Net income for common stock                 54,730 51,301 57,727  
Assets 6,014,755       5,566,222       6,014,755 5,566,222 5,244,686  
Net income                 54,730 51,301 57,727  
As previously filed                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Income taxes (benefit)                   91,712 84,341  
Net income for common stock                   168,320 161,516  
Other assets         541,542         541,542    
Assets         11,184,161         11,184,161    
Total capitalization and liabilities         11,184,161         11,184,161    
Deferred income taxes         631,734         631,734    
Total liabilities         9,358,440         9,358,440    
Retained earnings         297,509         297,509 255,694 216,804
Total shareholders’ equity         1,791,428         1,791,428 1,727,070 1,593,865
Net income                   170,210 163,406  
Increase in deferred income taxes                   103,916 80,399  
Change in other assets and liabilities                   (94,966) (11,696)  
As previously filed | Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                   176,878 171,090  
Operating income                   75,619 87,057  
Adjustment                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Income taxes (benefit)                   3,867 1,896  
Net income for common stock                   (191) 193  
Other assets         981         981    
Assets         981         981    
Total capitalization and liabilities         981         981    
Deferred income taxes         1,836         1,836    
Total liabilities         1,836         1,836    
Retained earnings         (855)         (855) (664) (857)
Total shareholders’ equity         (855)         (855) (664) $ (857)
Net income                   (191) 193  
Increase in deferred income taxes                   310 (254)  
Change in other assets and liabilities                   (119) 61  
Adjustment | Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                   (3,676) (2,089)  
Operating income                   3,676 2,089  
Reclassifications                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Change in other assets and liabilities                   (6,111) (2,657)  
American Savings Bank (ASB)                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Income taxes (benefit)                 29,082 27,994 31,421  
Other assets 309,946       305,416       309,946 305,416    
Assets 6,014,755       5,566,222       6,014,755 5,566,222    
Total capitalization and liabilities 6,014,755       5,566,222       6,014,755 5,566,222    
Total liabilities 5,454,865       5,032,434       5,454,865 5,032,434    
Retained earnings 236,664       211,934       236,664 211,934    
Total shareholders’ equity $ 559,890       533,788       559,890 533,788    
Net income                 $ 54,730 51,301 57,727  
American Savings Bank (ASB) | Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                   156,268 157,415  
Operating income                   79,295 89,148  
Income taxes (benefit)                   27,994 31,421  
Net income for common stock                   51,301 57,727  
Other assets         305,416         305,416    
Assets         5,566,222         5,566,222    
Total capitalization and liabilities         5,566,222         5,566,222    
Deferred income taxes         118,363         118,363    
Total liabilities         5,032,434         5,032,434    
Retained earnings         211,934         211,934    
Total shareholders’ equity         533,788         533,788    
American Savings Bank (ASB) | As previously filed | Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                   159,944 159,504  
Operating income                   75,619 87,059  
Income taxes (benefit)                   24,127 29,525  
Net income for common stock                   51,492 57,534  
Other assets         304,435         304,435    
Assets         5,565,241         5,565,241    
Total capitalization and liabilities         5,565,241         5,565,241    
Deferred income taxes         116,527         116,527    
Total liabilities         5,030,598         5,030,598    
Retained earnings         212,789         212,789    
Total shareholders’ equity         534,643         534,643    
American Savings Bank (ASB) | Adjustment | Bank                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Total expenses                   (3,676) (2,089)  
Operating income                   3,676 2,089  
Income taxes (benefit)                   3,867 1,896  
Net income for common stock                   (191) $ 193  
Other assets         981         981    
Assets         981         981    
Total capitalization and liabilities         981         981    
Deferred income taxes         1,836         1,836    
Total liabilities         1,836         1,836    
Retained earnings         (855)         (855)    
Total shareholders’ equity         $ (855)         $ (855)