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Fair value measurements - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Weighted average discount rate (as a percent) 2.658%    
Mortgage revenue bond      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, January 1 $ 15,427 $ 0 $ 0
Principal payments received 0 0  
Purchases 0 0  
Unrealized gain (loss) included in other comprehensive income 0 0  
Balance, March 31 15,427 $ 0 $ 15,427
American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Loans receivable transferred out of Level 3 measurement during period $ 6,100