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Bank segment - Loan modifications (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) contract | Mar. 31, 2016 USD ($) contract | Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | $ 29,401 |  | $ 37,637
Residential 1-4 family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 13,661 |  | 14,450
Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 1,297 |  | 1,346
Home equity line of credit |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 4,894 |  | 4,934
Residential land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | 2,246 |  | 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 | 7,234 |  | 14,146
Consumer loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-modification outstanding recorded investment | $ 69 |  | $ 10
Troubled debt restructurings real estate loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in contracts) | contract | 13 | 17 |
Pre-modification outstanding recorded investment | $ 1,139 | $ 17,966 |
Post-modification outstanding recorded investment | 1,133 | 18,084 |
Net increase in allowance | $ 106 | $ 760 |
Troubled debt restructurings real estate loans | Residential 1-4 family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in contracts) | contract | 3 | 4 |
Pre-modification outstanding recorded investment | $ 512 | $ 1,097 |
Post-modification outstanding recorded investment | 520 | 1,215 |
Net increase in allowance | $ 45 | $ 161 |
Troubled debt restructurings real estate loans | Commercial real estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in 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 (in contracts) | contract | 8 | 10 |
Pre-modification outstanding recorded investment | $ 226 | $ 669 |
Post-modification outstanding recorded investment | 212 | 669 |
Net increase in allowance | $ 34 | $ 74 |
Troubled debt restructurings real estate loans | Residential land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in 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 construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in 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 (in 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 (in contracts) | contract | 1 | 3 |
Pre-modification outstanding recorded investment | $ 342 | $ 16,200 |
Post-modification outstanding recorded investment | 342 | 16,200 |
Net increase in allowance | $ 0 | $ 525 |
Troubled debt restructurings real estate loans | Consumer loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of contracts (in contracts) | contract | 1 | 0 |
Pre-modification outstanding recorded investment | $ 59 | $ 0 |
Post-modification outstanding recorded investment | 59 | 0 |
Net increase in allowance | $ 27 | $ 0 |

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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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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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