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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | $ 25,143 | $ 23,591
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 22,627 | 20,814
Residential 1-4 family |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 13,578 | 12,598
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 10,874 | 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 | 1,004 | 1,016
Home equity line of credit |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 5,049 | 4,466
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 8,467 | 6,584
Residential land |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 853 | 841
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 331 | 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 | 2,714 | 3,069
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,886 | 1,741
Consumer loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 2,949 | 2,617
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | $ 65 | $ 66

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