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Other expenses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Income and Expenses [Abstract]        
Deposit liabilities and reinsurance contracts investment expense $ 837 $ 719 $ 1,481 $ 1,219
Change in fair value of embedded derivatives in deposit and reinsurance contracts (1) 183 40 326 210
Other expenses $ 1,020 $ 759 $ 1,807 $ 1,429