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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