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Bank segment (HEI only) - Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securities sold under agreements to repurchase      
Callable quarterly at par until maturity in 2016   $ 50,300  
Overnight      
Securities sold under agreements to repurchase      
Repurchase liability $ 79,083 $ 122,684  
Weighted-average interest rate 0.15% 0.15%  
1 to 29 days      
Securities sold under agreements to repurchase      
Repurchase liability $ 0 $ 0  
Weighted-average interest rate 0.00% 0.00%  
30 to 90 days      
Securities sold under agreements to repurchase      
Repurchase liability $ 13,535 $ 18,535  
Weighted-average interest rate 0.70% 0.29%  
Over 90 days      
Securities sold under agreements to repurchase      
Repurchase liability $ 0 $ 87,363  
Weighted-average interest rate 0.00% 2.96%  
Collateralized by mortgage-related securities and federal agency obligations      
Securities sold under agreements to repurchase      
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest $ 115,544 $ 261,063  
Collateralized by mortgage-related securities and federal agency obligations | Overnight      
Securities sold under agreements to repurchase      
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest 100,305 144,146  
Collateralized by mortgage-related securities and federal agency obligations | 1 to 29 days      
Securities sold under agreements to repurchase      
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest 0 0  
Collateralized by mortgage-related securities and federal agency obligations | 30 to 90 days      
Securities sold under agreements to repurchase      
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest 15,239 20,364  
Collateralized by mortgage-related securities and federal agency obligations | Over 90 days      
Securities sold under agreements to repurchase      
Collateralized by mortgage-related securities and federal agency obligations at fair value plus accrued interest 0 96,553  
Identical securities      
Securities sold under agreements to repurchase      
Repurchase liability $ 92,618 $ 228,582 $ 191,000
Weighted-average interest rate 0.23% 1.24% 1.45%