The amortized cost and fair value of securities classified as AFS are summarized below:



(in 000s)
As of April 30,	2014								2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Mortgage-backed securities	$	420,697	$	2,798	$	—	$	423,495	$	476,450	$	6,592	$	(664	)	$	482,378
Municipal bonds	4,120		209		—		4,329		4,178		320		—			4,498
	$	424,817	$	3,007	$	—	$	427,824	$	480,628	$	6,912	$	(664	)	$	486,876

During fiscal year 2014, we recorded other-than-temporary impairments of AFS securities totaling $12.4 million. We did not record any other-than-temporary impairments of AFS securities during fiscal years 2013 or 2012.

Substantially all AFS debt securities held as of April 30, 2014 mature after five years.