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Bank segment - Loan modifications (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) contract | Mar. 31, 2017 USD ($) contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | $ 22,627 |  | $ 20,814
Residential 1-4 family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 10,874 |  | 10,982
Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 1,004 |  | 1,016
Home equity line of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 8,467 |  | 6,584
Residential land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 331 |  | 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 | 1,886 |  | 1,741
Consumer loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | $ 65 |  | $ 66
Troubled debt restructurings real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 25 | 13 |
Pre-modification outstanding recorded investment | $ 4,869 | $ 1,139 |
Post-modification outstanding recorded investment | 4,878 | 1,133 |
Net increase in allowance | $ 404 | $ 106 |
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 1 | 3 |
Pre-modification outstanding recorded investment | $ 339 | $ 512 |
Post-modification outstanding recorded investment | 344 | 520 |
Net increase in allowance | $ 16 | $ 45 |
Troubled debt restructurings real estate loans | Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Home equity line of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 18 | 8 |
Pre-modification outstanding recorded investment | $ 2,170 | $ 226 |
Post-modification outstanding recorded investment | 2,174 | 212 |
Net increase in allowance | $ 388 | $ 34 |
Troubled debt restructurings real estate loans | Residential land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 1 | 0 |
Pre-modification outstanding recorded investment | $ 109 | $ 0 |
Post-modification outstanding recorded investment | 109 | 0 |
Net increase in allowance | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Commercial construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Residential construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 0 | 0 |
Pre-modification outstanding recorded investment | $ 0 | $ 0 |
Post-modification outstanding recorded investment | 0 | 0 |
Net increase in allowance | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Commercial loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 5 | 1 |
Pre-modification outstanding recorded investment | $ 2,251 | $ 342 |
Post-modification outstanding recorded investment | 2,251 | 342 |
Net increase in allowance | $ 0 | $ 0 |
Troubled debt restructurings real estate loans | Consumer loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts | contract | 0 | 1 |
Pre-modification outstanding recorded investment | $ 0 | $ 59 |
Post-modification outstanding recorded investment | 0 | 59 |
Net increase in allowance | $ 0 | $ 27 |

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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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