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Bank segment (HEI only) - Changes in the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for loan losses:      
Valuation allowance, balance at the beginning of the period $ 50,038 $ 45,618 $ 40,116
Provision for loan losses 16,763 6,275 6,126
Charge-offs 11,268 1,855 624
Valuation allowance, balance at the end of the period $ 55,533 $ 50,038 $ 45,618
Ratio of net charge-offs to average loans outstanding (as a percent) 0.24% 0.04% 0.01%
Real estate loans      
Allowance for loan losses:      
Charge-offs $ (52) $ (252) $ (1,137)
Other loans      
Allowance for loan losses:      
Charge-offs $ 11,320 $ 2,107 $ 1,761