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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | $ 27,917 | $ 23,591
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 26,224 | 20,814
Residential 1-4 family |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 12,768 | 12,598
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 10,701 | 10,982
Commercial real estate |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 0
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 981 | 1,016
Home equity line of credit |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 7,191 | 4,466
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 11,131 | 6,584
Residential land |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 516 | 841
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,542 | 425
Commercial construction |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 0
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 0 | 0
Residential construction |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 0
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 0 | 0
Commercial loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 4,176 | 3,069
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,806 | 1,741
Consumer loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 3,266 | 2,617
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | $ 63 | $ 66

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