Financial instruments with off-balance sheet risk or concentrations of credit risk (Tables)

3 Months Ended

Mar. 31, 2014

Guarantees [Abstract]

Schedule of certain information related to the Company’s written credit derivatives

The following table sets forth certain information related to the Company’s written credit derivatives as of March 31, 2014 and December 31, 2013:

March 31, 2014	Maximum Payout/ Notional Amount (by period of expiration)						Fair Value of Written Credit Derivatives (2)
Credit Spreads on underlying (basis points)	0-5 years		5 years or Greater Expiring Through 2046		Total Written Credit Default Swaps (1)		Asset		Liability		Net Asset/(Liability)
	($ in thousands)
Single name (0 - 250)	$	—	$	—	$	—	$	—	$	—	$	—
Single name (251-500)	8,652		2,218		10,870		924		—		924
Index (0-250)	—		—		—		—		—		—
	$	8,652	$	2,218	$	10,870	$	924	$	—	$	924

December 31, 2013	Maximum Payout/ Notional Amount (by period of expiration)						Fair Value of Written Credit Derivatives (2)
Credit Spreads on underlying (basis points)	0-5 years		5 years or Greater Expiring Through 2046		Total Written Credit Default Swaps (1)		Asset		Liability			Net Asset/(Liability)
	($ in thousands)
Single name (0 - 250)	$	368	$	—	$	368	$	—	$	(104	)	$	(104	)
Single name (251-500)	9,514		—		9,514		1,136		—			1,136
Index (0-250)	—		550		550		21		(244		)	(223		)
	$	9,882	$	550	$	10,432	$	1,157	$	(348	)	$	809

(1) As of March 31, 2014 and December 31, 2013, the Company did not hold any offsetting buy protection credit derivatives with the same underlying reference obligation.

(2) Fair value amounts of derivative contracts are shown on a gross basis prior to cash collateral or counterparty netting.