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Bank segment - Loan modifications (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 26,224 |  | $ 20,814
Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 10,701 |  | 10,982
Commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 981 |  | 1,016
Home equity line of credit |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 11,131 |  | 6,584
Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | 1,542 |  | 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 |  |  | 1,806 |  | 1,741
Consumer loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Post-modification outstanding recorded investment |  |  | $ 63 |  | $ 66
Troubled debt restructurings real estate loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 28 | 18 | 76 | 38 |
Pre-modification outstanding recorded investment | $ 4,034 | $ 1,275 | $ 12,284 | $ 3,072 |
Post-modification outstanding recorded investment | 4,058 | 1,275 | 12,317 | 3,066 |
Net increase in allowance | $ 398 | $ 222 | $ 1,398 | $ 387 |
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 3 | 2 | 4 | 7 |
Pre-modification outstanding recorded investment | $ 632 | $ 83 | $ 971 | $ 955 |
Post-modification outstanding recorded investment | 649 | 83 | 993 | 963 |
Net increase in allowance | $ 1 | $ 0 | $ 17 | $ 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 | 16 | 15 | 55 | 28 |
Pre-modification outstanding recorded investment | $ 1,584 | $ 862 | $ 7,092 | $ 1,386 |
Post-modification outstanding recorded investment | 1,585 | 862 | 7,097 | 1,372 |
Net increase in allowance | $ 263 | $ 184 | $ 1,205 | $ 277 |
Troubled debt restructurings real estate loans | Residential land |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of contracts | contract | 3 | 0 | 4 | 0 |
Pre-modification outstanding recorded investment | $ 1,562 | $ 0 | $ 1,671 | $ 0 |
Post-modification outstanding recorded investment | 1,568 | 0 | 1,677 | 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 | 6 | 1 | 13 | 2 |
Pre-modification outstanding recorded investment | $ 256 | $ 330 | $ 2,550 | $ 672 |
Post-modification outstanding recorded investment | 256 | 330 | 2,550 | 672 |
Net increase in allowance | $ 134 | $ 38 | $ 176 | $ 38 |
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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