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Bank segment (HEI only) - Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Securities sold under agreements to repurchase    
Repurchase liability $ 65,040 $ 140,859
Weighted-average interest rate 0.75% 0.65%
Collateralized by mortgage-related securities and federal agency obligations    
Securities sold under agreements to repurchase    
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest $ 92,290 $ 165,464
Overnight    
Securities sold under agreements to repurchase    
Repurchase liability $ 65,040 $ 140,859
Weighted-average interest rate 0.75% 0.65%
Overnight | Collateralized by mortgage-related securities and federal agency obligations    
Securities sold under agreements to repurchase    
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest $ 92,290 $ 165,464
1 to 29 days    
Securities sold under agreements to repurchase    
Repurchase liability $ 0 $ 0
Weighted-average interest rate 0.00% 0.00%
1 to 29 days | Collateralized by mortgage-related securities and federal agency obligations    
Securities sold under agreements to repurchase    
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest $ 0 $ 0
30 to 90 days    
Securities sold under agreements to repurchase    
Repurchase liability $ 0 $ 0
Weighted-average interest rate 0.00% 0.00%
30 to 90 days | Collateralized by mortgage-related securities and federal agency obligations    
Securities sold under agreements to repurchase    
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest $ 0 $ 0
Over 90 days    
Securities sold under agreements to repurchase    
Repurchase liability $ 0 $ 0
Weighted-average interest rate 0.00% 0.00%
Over 90 days | Collateralized by mortgage-related securities and federal agency obligations    
Securities sold under agreements to repurchase    
Collateralized by mortgage-backed securities and federal agency obligations at fair value plus accrued interest $ 0 $ 0