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Bank segment - Loan modifications (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) contract | Jun. 30, 2016 USD ($) contract | Jun. 30, 2017 USD ($) contract | Jun. 30, 2016 USD ($) contract | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 23,383 |  | $ 37,637
Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 13,112 |  | 14,450
Commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 1,289 |  | 1,346
Home equity line of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 4,548 |  | 4,934
Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 1,674 |  | 2,751
Commercial construction |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 0 |  | 0
Residential construction |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 0 |  | 0
Commercial loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 2,692 |  | 14,146
Consumer loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 68 |  | $ 10
Troubled debt restructurings real estate loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 7 | 19 | 20 | 36 |
Pre-modification outstanding recorded investment | $ 658 | $ 2,236 | $ 1,797 | $ 20,202 |
Post-modification outstanding recorded investment | 658 | 2,231 | 1,791 | 20,315 |
Net increase in allowance | $ 59 | $ 424 | $ 165 | $ 1,184 |
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 2 | 5 | 5 | 9 |
Pre-modification outstanding recorded investment | $ 360 | $ 891 | $ 872 | $ 1,988 |
Post-modification outstanding recorded investment | 360 | 885 | 880 | 2,100 |
Net increase in allowance | $ 0 | $ 98 | $ 45 | $ 259 |
Troubled debt restructurings real estate loans | Commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 0 | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Home equity line of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 5 | 8 | 13 | 18 |
Pre-modification outstanding recorded investment | $ 298 | $ 768 | $ 524 | $ 1,437 |
Post-modification outstanding recorded investment | 298 | 768 | 510 | 1,437 |
Net increase in allowance | $ 59 | $ 181 | $ 93 | $ 255 |
Troubled debt restructurings real estate loans | Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 1 | 0 | 1 |
Pre-modification outstanding recorded investment | $ 0 | $ 120 | $ 0 | $ 120 |
Post-modification outstanding recorded investment | 0 | 121 | 0 | 121 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Commercial construction |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 0 | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Residential construction |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 0 | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Commercial loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 5 | 1 | 8 |
Pre-modification outstanding recorded investment | $ 0 | $ 457 | $ 342 | $ 16,657 |
Post-modification outstanding recorded investment | 0 | 457 | 342 | 16,657 |
Net increase in allowance | $ 0 | $ 145 | $ 0 | $ 670 |
Troubled debt restructurings real estate loans | Consumer loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts (in contracts) | contract | 0 | 0 | 1 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 59 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 | 59 | 0 |
Net increase in allowance | $ 0 | $ 0 | $ 27 | $ 0 |

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