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Investment Securities, Available-for-Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Oct. 31, 2017
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) $ 1,000 $ 500  
Available For Sale Securities Gross Realized Gain (Loss) Net Abstract      
Available-for-sale securities realized gains 5 203  
Available-for-sale securities realized losses 0 0  
Available-for-sale securities net realized gains 5 $ 203  
Investment securities, available-for-sale      
Schedule Of Available For Sale Securities [Line Items]      
Available-for-sale securities at cost 15,776   $ 15,755
Available-for-sale securities unrealized gross gains 7,688   6,718
Available-for-sale securities unrealized gross losses (17)   (8)
Available-for-sale securities at fair value 23,447   $ 22,465
Available-for-sale securities fair value associated with the unrealized losses $ 100