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Bank segment - Loan modifications (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract | Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 24,133 |  | $ 20,814
Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 10,777 |  | 10,982
Commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 993 |  | 1,016
Home equity line of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 10,255 |  | 6,584
Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 328 |  | 425
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 |  |  | 1,716 |  | 1,741
Consumer loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 64 |  | $ 66
Troubled debt restructurings real estate loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 23 | 7 | 48 | 20 |
Pre-modification outstanding recorded investment | $ 3,381 | $ 658 | $ 8,250 | $ 1,797 |
Post-modification outstanding recorded investment | 3,381 | 658 | 8,259 | 1,791 |
Net increase in allowance | $ 596 | $ 59 | $ 1,000 | $ 165 |
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 0 | 2 | 1 | 5 |
Pre-modification outstanding recorded investment | $ 0 | $ 360 | $ 339 | $ 872 |
Post-modification outstanding recorded investment | 0 | 360 | 344 | 880 |
Net increase in allowance | $ 0 | $ 0 | $ 16 | $ 45 |
Troubled debt restructurings real estate loans | Commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of 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 | contract | 21 | 5 | 39 | 13 |
Pre-modification outstanding recorded investment | $ 3,338 | $ 298 | $ 5,508 | $ 524 |
Post-modification outstanding recorded investment | 3,338 | 298 | 5,512 | 510 |
Net increase in allowance | $ 554 | $ 59 | $ 942 | $ 93 |
Troubled debt restructurings real estate loans | Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 0 | 0 | 1 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 109 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 | 109 | 0 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Commercial construction |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of 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 | 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 | contract | 2 | 0 | 7 | 1 |
Pre-modification outstanding recorded investment | $ 43 | $ 0 | $ 2,294 | $ 342 |
Post-modification outstanding recorded investment | 43 | 0 | 2,294 | 342 |
Net increase in allowance | $ 42 | $ 0 | $ 42 | $ 0 |
Troubled debt restructurings real estate loans | Consumer loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 1 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 | $ 0 | $ 59 |
Post-modification outstanding recorded investment | 0 | 0 | 0 | 59 |
Net increase in allowance | $ 0 | $ 0 | $ 0 | $ 27 |

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