Offsetting Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Offsetting Assets and Liabilities [Abstract]

Offsetting of financial assets and financial liabilities

The following table presents offsetting of securities borrowed as of March 31, 2013 and December 31, 2012:

	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Pledged		Net Amount
	(in thousands)
March 31, 2013	$	151,768	$	—	$	151,768	$	—	$	151,768	$	—
December 31, 2012	$	106,350	$	—	$	106,350	$	—	$	106,350	$	—

The following table presents offsetting of securities loaned as of March 31, 2013 and December 31, 2012:

	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Received		Net Amount
	(in thousands)
March 31, 2013	$	58,183	$	—	$	58,183	$	—	$	58,183	$	—
December 31, 2012	$	12,517	$	—	$	12,517	$	—	$	12,517	$	—