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Bank segment - Mortgage servicing rights (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Servicing Asset at Amortized Cost [Line Items]            
Repurchase reserve       $ 100,000   $ 0
American Savings Bank (ASB)            
Servicing Asset at Amortized Cost [Line Items]            
Mortgage service fees $ 700,000 $ 900,000        
Movement in Mortgage Loans on Real Estate [Roll Forward]            
Servicing asset - beginning balance 8,884,000          
Servicing asset - ending balance 8,857,000   $ 8,884,000      
American Savings Bank (ASB) | Residential loan            
Servicing Asset at Amortized Cost [Line Items]            
Proceeds from sale of mortgage loans 40,400,000 78,300,000        
Gain on sale of mortgage loans 1,200,000 1,800,000        
Repurchased mortgage loans 0 0        
American Savings Bank (ASB) | Mortgage Servicing Rights (MSR)            
Servicing Asset at Amortized Cost [Line Items]            
Gross carrying amount       14,986,000 $ 14,531,000  
Accumulated amortization       (6,129,000) (5,647,000)  
Valuation allowance 0 (209,000) (209,000) 0 0 (41,000)
Net carrying amount       8,857,000 8,884,000 $ 11,965,000
Movement in Mortgage Loans on Real Estate [Roll Forward]            
Servicing asset - beginning balance 8,884,000 11,749,000 11,749,000      
Amount capitalized 455,000 906,000        
Amortization (482,000) (647,000)        
Other-than-temporary impairment 0 (2,000)        
Servicing asset - ending balance 8,857,000 12,006,000 8,884,000      
Valuation Allowance [Roll Forward]            
Valuation allowance, beginning balance 0 209,000 209,000      
Provision (recovery) 0 (166,000)        
Other-than-temporary impairment 0 (2,000)        
Valuation allowance, ending balance $ 0 $ 41,000 $ 0      
Unpaid principal balance       1,114,800,000 1,097,314,000  
Weighted average note-rate 4.04%   4.05%      
Weighted average discount rate 9.60%   9.60%      
Weighted average prepayment speed 10.80%   9.30%      
Prepayment rate - 25 points adverse rate change       (537,000) (561,000)  
Prepayment rate - 50 points adverse rate change       (1,008,000) (1,104,000)  
Discount rate - 25 points adverse rate change       (99,000) (111,000)  
Discount rate - 50 points adverse rate change       $ (196,000) $ (220,000)  
American Savings Bank (ASB) | Measurement Band A            
Valuation Allowance [Roll Forward]            
Measurement band percent for risk categorization 0.50%          
American Savings Bank (ASB) | Measurement Band B            
Valuation Allowance [Roll Forward]            
Measurement band percent for risk categorization 1.00%