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Bank segment (HEI only) - Loan Modifications (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Loan modifications determined to be troubled debt restructurings |  |  |
Commitments to Borrowers whose Loan Terms are Impaired or Modified under Troubled Debt Restructuring | $ 0 | $ 2,600,000 |
Troubled debt restructurings real estate loans |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 64 | 67 | 68
Pre-modification outstanding recorded investment | $ 4,798,000 | $ 26,937,000 | $ 10,020,000
Post-modification outstanding recorded investment | 4,792,000 | 27,052,000 | 10,094,000
Net increase in ALLL | $ 877,000 | $ 1,756,000 | $ 943,000
Minimum period of payment default of loans determined to be TDRs | 90 days | 90 days | 90 days
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 7 | 14 | 19
Pre-modification outstanding recorded investment | $ 742,000 | $ 3,131,000 | $ 3,594,000
Post-modification outstanding recorded investment | 750,000 | 3,245,000 | 3,668,000
Net increase in ALLL | $ 45,000 | $ 337,000 | $ 87,000
Troubled debt restructurings real estate loans | Commercial real estate |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 1
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 1,500,000
Post-modification outstanding recorded investment | 0 | 0 | 1,500,000
Net increase in ALLL | $ 0 | $ 0 | $ 0
Troubled debt restructurings real estate loans | Home equity line of credit |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 46 | 36 | 39
Pre-modification outstanding recorded investment | $ 3,016,000 | $ 3,337,000 | $ 2,441,000
Post-modification outstanding recorded investment | 3,002,000 | 3,337,000 | 2,441,000
Net increase in ALLL | $ 557,000 | $ 554,000 | $ 370,000
Troubled debt restructurings real estate loans | Residential land |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 1 | 2 | 1
Pre-modification outstanding recorded investment | $ 92,000 | $ 203,000 | $ 218,000
Post-modification outstanding recorded investment | 92,000 | 204,000 | 218,000
Net increase in ALLL | $ 0 | $ 0 | $ 0
Troubled debt restructurings real estate loans | Commercial construction |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | 0 | 0 | 0
Net increase in ALLL | $ 0 | $ 0 | $ 0
Troubled debt restructurings real estate loans | Residential construction |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0
Post-modification outstanding recorded investment | 0 | 0 | 0
Net increase in ALLL | $ 0 | $ 0 | $ 0
Troubled debt restructurings real estate loans | Commercial |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 9 | 15 | 8
Pre-modification outstanding recorded investment | $ 889,000 | $ 20,266,000 | $ 2,267,000
Post-modification outstanding recorded investment | 889,000 | 20,266,000 | 2,267,000
Net increase in ALLL | $ 248,000 | $ 865,000 | $ 486,000
Troubled debt restructurings real estate loans | Consumer |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 1 | 0 | 0
Pre-modification outstanding recorded investment | $ 59,000 | $ 0 | $ 0
Post-modification outstanding recorded investment | 59,000 | 0 | 0
Net increase in ALLL | $ 27,000 | $ 0 | $ 0
Troubled debt restructurings that subsequently defaulted |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 1 | 2 | 2
Recorded investment | $ 222,000 | $ 263,000 | $ 1,062,000
Consumer mortgage loans collateralized by residential real estate property in foreclosure process | $ 4,300,000 | $ 3,900,000 |
Troubled debt restructurings that subsequently defaulted | Residential 1-4 family |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 1 | 1 | 0
Recorded investment | $ 222,000 | $ 239,000 | $ 0
Troubled debt restructurings that subsequently defaulted | Commercial real estate |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Recorded investment | $ 0 | $ 0 | $ 0
Troubled debt restructurings that subsequently defaulted | Home equity line of credit |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 1
Recorded investment | $ 0 | $ 0 | $ 6,000
Troubled debt restructurings that subsequently defaulted | Residential land |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Recorded investment | $ 0 | $ 0 | $ 0
Troubled debt restructurings that subsequently defaulted | Commercial construction |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Recorded investment | $ 0 | $ 0 | $ 0
Troubled debt restructurings that subsequently defaulted | Residential construction |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Recorded investment | $ 0 | $ 0 | $ 0
Troubled debt restructurings that subsequently defaulted | Commercial |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 1 | 1
Recorded investment | $ 0 | $ 24,000 | $ 1,056,000
Troubled debt restructurings that subsequently defaulted | Consumer |  |  |
Loan modifications determined to be troubled debt restructurings |  |  |
Number of contracts | contract | 0 | 0 | 0
Recorded investment | $ 0 | $ 0 | $ 0

X
- Definition Represents the commitments to borrowers whose loan terms are impaired or modified under troubled debt restructuring. + References No definition available. + Details
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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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