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Bank segment - Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative instrument          
Net gains (losses) recognized in the Statement of Income $ (131) $ (227) $ 155 $ (603)  
Not designated as a hedging instrument          
Derivative instrument          
Asset derivative 454   454   $ 398
Liability derivative 15   15   114
Interest rate lock commitments          
Derivative instrument          
Notional amount 33,178   33,178   29,330
Fair value 446   446   390
Interest rate lock commitments | Not designated as a hedging instrument          
Derivative instrument          
Asset derivative 448   448   393
Liability derivative 2   2   3
Interest rate lock commitments | Not designated as a hedging instrument | Mortgage banking income          
Derivative instrument          
Net gains (losses) recognized in the Statement of Income (389) (194) 56 (464)  
Forward sale contracts          
Derivative instrument          
Notional amount 28,551   28,551   32,833
Fair value (7)   (7)   (106)
Forward sale contracts | Not designated as a hedging instrument          
Derivative instrument          
Asset derivative 6   6   5
Liability derivative 13   13   $ 111
Forward sale contracts | Not designated as a hedging instrument | Mortgage banking income          
Derivative instrument          
Net gains (losses) recognized in the Statement of Income $ 258 $ (33) $ 99 $ (139)