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Investment Securities, Available-for-Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 31, 2017
Jan. 31, 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 $ (1,100)  
Available For Sale Securities Gross Realized Gain (Loss) Net Abstract      
Available-for-sale securities realized gains 203 135  
Available-for-sale securities realized losses 0 0  
Available-for-sale securities net realized gains (losses) 203 $ 135  
Available-for-sale Securities [Member]      
Schedule Of Available For Sale Securities [Line Items]      
Available-for-sale securities at cost 4,828   $ 8,528
Available-for-sale securities unrealized gross gains 5,329   4,798
Available-for-sale securities unrealized gross losses (9)   (14)
Available-for-sale securities at fair value 10,148   $ 13,312
Available-for-sale securities fair value associated with the unrealized losses $ 300