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Bank segment - Troubled debt restructuring that subsequently defaulted (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 2 | 1
Recorded investment | $ | $ 0 | $ 0 | $ 372 | $ 222
Residential 1-4 family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 1
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 222
Commercial real estate |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 0
Home equity line of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 1 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 81 | $ 0
Residential land |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 0
Residential construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 0
Commercial loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 1 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 291 | $ 0
Consumer loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 0 | 0 | 0 | 0
Recorded investment | $ | $ 0 | $ 0 | $ 0 | $ 0

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