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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) contract | Jun. 30, 2014 USD ($) contract | Jun. 30, 2015 USD ($) contract | Jun. 30, 2014 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 18 | 18 | 33 | 33
Pre-modification outstanding recorded investment | $ 1,169 | $ 5,863 | $ 2,567 | $ 8,390
Post-modification outstanding recorded investment | 1,169 | 5,881 | 2,585 | 8,422
Net increases in ALL | $ 183 | $ 432 | $ 285 | $ 665
Residential 1-4 family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 2 | 7 | 7 | 12
Pre-modification outstanding recorded investment | $ 318 | $ 2,194 | $ 1,195 | $ 3,115
Post-modification outstanding recorded investment | $ 318 | 2,212 | 1,213 | 3,147
Net increases in ALL |  | $ 207 | $ 47 | $ 251
Home equity line of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 13 |  | 22 |
Pre-modification outstanding recorded investment | $ 690 |  | $ 1,119 |
Post-modification outstanding recorded investment | 690 |  | 1,119 |
Net increases in ALL | $ 105 |  | $ 160 |
Residential land |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract |  | 9 |  | 16
Pre-modification outstanding recorded investment |  | $ 2,915 |  | $ 4,048
Post-modification outstanding recorded investment |  | 2,915 |  | 4,048
Net increases in ALL |  | $ 225 |  | $ 400
Commercial loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 3 | 2 | 4 | 5
Pre-modification outstanding recorded investment | $ 161 | $ 754 | $ 253 | $ 1,227
Post-modification outstanding recorded investment | 161 | $ 754 | 253 | 1,227
Net increases in ALL | $ 78 |  | $ 78 | $ 14

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