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Fair value measurements - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Weighted average discount rate (as a percent)     2.82%    
Mortgage revenue bond          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance $ 15,427 $ 0 $ 15,427 $ 0 $ 0
Principal payments received 0 0 0 0  
Purchases 0 0 0 0  
Unrealized gain (loss) included in other comprehensive income 0 0 0 0  
Ending balance $ 15,427 $ 0 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