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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) contract | Sep. 30, 2014 USD ($) contract | Sep. 30, 2015 USD ($) contract | Sep. 30, 2014 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 15 | 11 | 48 | 44
Pre-modification outstanding recorded investment | $ 3,011 | $ 4,747 | $ 5,578 | $ 13,137
Post-modification outstanding recorded investment | 3,017 | 4,772 | 5,602 | 13,194
Net increases in ALL | $ 157 | $ 43 | $ 442 | $ 708
Residential 1-4 family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 3 | 6 | 10 | 18
Pre-modification outstanding recorded investment | $ 860 | $ 1,800 | $ 2,055 | $ 4,915
Post-modification outstanding recorded investment | 866 | 1,825 | 2,079 | 4,972
Net increases in ALL | $ 1 | $ 43 | $ 48 | $ 294
Home equity line of credit |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 10 | 1 | 32 | 1
Pre-modification outstanding recorded investment | $ 943 | $ 91 | $ 2,062 | $ 91
Post-modification outstanding recorded investment | 943 | 91 | 2,062 | 91
Net increases in ALL | $ 140 | $ 0 | $ 300 | $ 0
Residential land |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract |  | 2 |  | 18
Pre-modification outstanding recorded investment |  | $ 256 |  | $ 4,304
Post-modification outstanding recorded investment |  | 256 |  | 4,304
Net increases in ALL |  | $ 0 |  | $ 400
Commercial loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of contracts | contract | 2 | 2 | 6 | 7
Pre-modification outstanding recorded investment | $ 1,208 | $ 2,600 | $ 1,461 | $ 3,827
Post-modification outstanding recorded investment | 1,208 | 2,600 | 1,461 | 3,827
Net increases in ALL | $ 16 | $ 0 | $ 94 | $ 14

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