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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | $ 45,356 | $ 36,886
Accruing loans 90 days or more past due | 0 | 0
Financing Receivable, Modifications, Post-Modification Recorded Investment | 22,426 | 24,107
Residential 1-4 family |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 19,987 | 19,253
Financing Receivable, Modifications, Post-Modification Recorded Investment | 14,182 | 13,525
Commercial real estate |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 5,112
Financing Receivable, Modifications, Post-Modification Recorded Investment | 0 | 0
Home equity line of credit |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 1,982 | 1,087
Financing Receivable, Modifications, Post-Modification Recorded Investment | 2,297 | 480
Residential land |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 975 | 720
Accruing loans 90 days or more past due | 0 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 4,735 | 7,130
Commercial construction |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 0
Financing Receivable, Modifications, Post-Modification Recorded Investment | 0 | 0
Residential construction |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 0 | 0
Financing Receivable, Modifications, Post-Modification Recorded Investment | 0 | 0
Commercial loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 21,767 | 10,053
Accruing loans 90 days or more past due |  | 0
Financing Receivable, Modifications, Post-Modification Recorded Investment | 1,212 | 2,972
Consumer loans |  |
Credit risk profile based on nonaccrual loans |  |
Nonaccrual loans | 645 | 661
Accruing loans 90 days or more past due |  | 0
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 0

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