Adjusted Cost and Estimated Market Value Available-for-Sale Investment (Table Text Block)

6 Months Ended

Sep. 30, 2014

Investments, Debt and Equity Securities [Abstract]

Adjusted Cost and Estimated Market Value of Available-for-sale Investments

		September 30, 2014				March 31, 2014
		Amortized Cost		Estimated Market Value		Amortized Cost		Estimated Market Value
		(Unaudited)				(Unaudited)
		(In thousands)				(In thousands)
Due in one year or less	$	40,037	$	41,254	$	20,235	$	20,475
Due after one year through five years		225,426		239,240		185,447		194,563
Due after five years through ten years		472,125		495,392		350,048		350,953
Due after ten years		410,410		426,455		531,645		521,289
		1,147,998		1,202,341		1,087,375		1,087,280
Mortgage backed securities		16,817		17,253		12,425		12,187
Redeemable preferred stocks		17,448		17,721		18,445		17,533
Common stocks		17,975		22,816		17,299		21,275
	$	1,200,238	$	1,260,131	$	1,135,544	$	1,138,275