The adjusted cost and estimated market value of available-for-sale investments by contractual maturity, were as follows:

		March 31, 2015				March 31, 2014
		Amortized Cost		Estimated Market Value		Amortized Cost		Estimated Market Value
		(In thousands)
Due in one year or less	$	36,355	$	37,055	$	20,235	$	20,475
Due after one year through five years		198,488		209,404		185,447		194,563
Due after five years through ten years		474,639		492,782		350,048		350,953
Due after ten years		472,003		502,092		531,645		521,289
		1,181,485		1,241,333		1,087,375		1,087,280

Mortgage backed securities		19,874		20,679		12,425		12,187
Redeemable preferred stocks		18,052		18,296		18,445		17,533
Equity securities		17,975		24,654		17,299		21,275
	$	1,237,386	$	1,304,962	$	1,135,544	$	1,138,275