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Comprehensive Income - Components of comprehensive income that are included in Consolidated Statement of Changes in Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Comprehensive Income (Loss) Note [Abstract]        
Change in unrealized gains on securities, Before Tax     $ (74) $ 70
Change in unrealized gains on securities, Tax Benefit (Expense)     26 (24)
Change in unrealized gains on securities, Net of Tax     (48) 46
Other comprehensive income (loss), available-for-sale securities adjustment, Before Tax     (74) 70
Other comprehensive income (loss), available-for-sale securities, Tax Benefit (Expense)     26 (24)
Other comprehensive income (loss), available-for-sale securities adjustment, Net of Tax $ (87) $ 19 $ (48) $ 46