Mortgage-backed Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Details
Mortgage-backed securities held to maturity pledged as collateral, Amortized Cost	$ 39,000	$ 53,000
Mortgage-backed securities held to maturity pledged as collateral, Fair Value	40,000	55,000
Available-for-sale mortgage-backed securities pledged as collateral, Amortized Cost	246,000	416,000
Available-for-sale mortgage-backed securities pledged as collateral, Fair Value	$ 254,000	$ 431,000