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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | $ 27,220 | $ 23,591
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 24,133 | 20,814
Residential 1-4 family |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 13,121 | 12,598
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 10,777 | 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 | 993 | 1,016
Home equity line of credit |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 6,051 | 4,466
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 10,255 | 6,584
Residential land |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 843 | 841
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 328 | 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 | 4,385 | 3,069
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,716 | 1,741
Consumer loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 2,820 | 2,617
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | $ 64 | $ 66

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