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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | $ 40,207 | $ 27,295
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 25,356 | 25,917
Residential 1-4 family |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 13,878 | 12,037
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 10,145 | 10,194
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 | 902 | 915
Home equity line of credit |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 6,888 | 6,348
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 11,013 | 11,597
Residential land |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 452 | 436
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,613 | 1,622
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 | 14,447 | 4,278
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | 1,622 | 1,527
Consumer loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 4,542 | 4,196
Accruing loans 90 days or more past due | 0 | 0
Total troubled debt restructuring loans not included above | $ 61 | $ 62

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