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Investment Securities, Available-for-Sale (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Oct. 31, 2016
Available-for-sale Securities, Gross Unrealized Gain (Loss) [Abstract]          
Net unrealized holding gains (losses) on investment securities classified as available-for-sale included in other comprehensive income (loss) $ 500,000 $ 1,100,000 $ 1,100,000 $ (23,000)  
Available For Sale Securities Gross Realized Gain (Loss) Net Abstract          
Available-for-sale securities realized gains 0 64,000 204,000 199,000  
Available-for-sale securities realized losses (1,000) (37,000) (1,000) (37,000)  
Available-for-sale securities net realized gains (losses) (1,000) $ 27,000 203,000 $ 162,000  
Available-for-sale Securities [Member]          
Schedule Of Available For Sale Securities [Line Items]          
Available-for-sale securities at cost 4,861,000   4,861,000   $ 8,528,000
Available-for-sale securities unrealized gross gains 5,859,000   5,859,000   4,798,000
Available-for-sale securities unrealized gross losses (8,000)   (8,000)   (14,000)
Available-for-sale securities at fair value 10,712,000   10,712,000   $ 13,312,000
Available-for-sale securities fair value associated with the unrealized losses $ 200,000   $ 200,000