Other expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Income and Expenses [Abstract]
Deposit liabilities and reinsurance contracts investment expense	$ 644	$ 500
Change in fair value of embedded derivatives in deposit and reinsurance contracts (1)	143	170
Other expenses	$ 787	$ 670