Investment Securities, Available-for-sale Securities, Maturities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Amortized Cost [Abstract]
Due in one year or less	$ 7,195
Due in one year through five years	247,453
Due after five years through ten years	507,942
Due after ten years	1,310
Amortized Cost	763,900
Fair Value [Abstract]
Due in one year or less	7,215
Due in one year through five years	245,708
Due after five years through ten years	487,028
Due after ten years	1,331
Available for sale debt securities, fair value	$ 741,282

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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