Available-for-Sale Investments (Table Text Block)

12 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-Sale Investments

Available-for-sale investments at March 31, 2015 were as follows:

		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses More than 12 Months		Gross Unrealized Losses Less than 12 Months		Estimated Market Value
		(In thousands)
U.S. treasury securities and government obligations	$	99,722	$	5,658	$	(64)	$	–	$	105,316
U.S. government agency mortgage-backed securities		30,569		2,614		(39)		(3)		33,141
Obligations of states and political subdivisions		165,724		13,052		(298)		(10)		178,468
Corporate securities		885,470		44,426		(2,522)		(2,966)		924,408
Mortgage-backed securities		19,874		806		(1)		–		20,679
Redeemable preferred stocks		18,052		521		(253)		(24)		18,296
Common stocks		17,975		6,719		–		(40)		24,654
	$	1,237,386	$	73,796	$	(3,177)	$	(3,043)	$	1,304,962

Available-for-sale investments at March 31, 2014 were as follows:

		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses More than 12 Months		Gross Unrealized Losses Less than 12 Months		Estimated Market Value
		(In thousands)
U.S. treasury securities and government obligations	$	49,883	$	1,475	$	–	$	(1,004)	$	50,354
U.S. government agency mortgage-backed securities		36,258		2,558		(4)		(425)		38,387
Obligations of states and political subdivisions		166,311		4,834		(308)		(3,627)		167,210
Corporate securities		834,923		26,075		(3,794)		(25,875)		831,329
Mortgage-backed securities		12,425		279		(3)		(514)		12,187
Redeemable preferred stocks		18,445		283		(82)		(1,113)		17,533
Common stocks		17,299		3,987		(1)		(10)		21,275
	$	1,135,544	$	39,491	$	(4,192)	$	(32,568)	$	1,138,275