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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans
$ in Thousands
3 Months Ended
Mar. 31, 2015
USD ($)
contract
Mar. 31, 2014
USD ($)
contract
Loan modifications determined to be troubled debt restructurings    
Number of contracts | contract 15 15
Pre-modification outstanding recorded investment $ 1,398 $ 2,527
Post-modification outstanding recorded investment 1,416 2,541
Net increases in ALL $ 102 $ 233
Residential 1-4 family    
Loan modifications determined to be troubled debt restructurings    
Number of contracts | contract 5 5
Pre-modification outstanding recorded investment $ 877 $ 921
Post-modification outstanding recorded investment 895 935
Net increases in ALL $ 47 $ 44
Home equity line of credit    
Loan modifications determined to be troubled debt restructurings    
Number of contracts | contract 9 0
Pre-modification outstanding recorded investment $ 429 $ 0
Post-modification outstanding recorded investment 429 0
Net increases in ALL $ 55 $ 0
Residential land    
Loan modifications determined to be troubled debt restructurings    
Number of contracts | contract 0 7
Pre-modification outstanding recorded investment $ 0 $ 1,133
Post-modification outstanding recorded investment 0 1,133
Net increases in ALL $ 0 $ 175
Commercial loans    
Loan modifications determined to be troubled debt restructurings    
Number of contracts | contract 1 3
Pre-modification outstanding recorded investment $ 92 $ 473
Post-modification outstanding recorded investment 92 473
Net increases in ALL $ 0 $ 14