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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
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Comprehensive Income (Loss) Note [Abstract]    
Change in unrealized gains on securities, Amount Before Tax $ (142) $ (131)
Change in unrealized gains on securities, Tax Benefit 50 46
Change in unrealized gains on securities, Amount Net of Tax (92) (85)
Other comprehensive income (loss), available-for-sale securities adjustment, Amount Before Tax (142) (131)
Other comprehensive income (loss), available-for-sale securities, Tax Benefit 50 46
Other comprehensive income (loss), available-for-sale securities adjustment, Amount Net of Tax $ (92) $ (85)