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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended
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Mar. 31, 2016 USD ($) contract | Mar. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 17 | 15
Pre-modification outstanding recorded investment | $ 17,966 | $ 1,398
Post-modification outstanding recorded investment | 18,084 | 1,416
Net increases in ALL | $ 760 | $ 102
Residential 1-4 family |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 4 | 5
Pre-modification outstanding recorded investment | $ 1,097 | $ 877
Post-modification outstanding recorded investment | 1,215 | 895
Net increases in ALL | $ 161 | $ 47
Home equity line of credit |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 10 | 9
Pre-modification outstanding recorded investment | $ 669 | $ 429
Post-modification outstanding recorded investment | 669 | 429
Net increases in ALL | $ 74 | $ 55
Residential land |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract |  | 0
Pre-modification outstanding recorded investment |  | $ 0
Post-modification outstanding recorded investment |  | 0
Net increases in ALL |  | $ 0
Commercial loans |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | contract | 3 | 1
Pre-modification outstanding recorded investment | $ 16,200 | $ 92
Post-modification outstanding recorded investment | 16,200 | 92
Net increases in ALL | $ 525 | $ 0

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