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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]        
Tax effect of unrealized gain (loss) on securities $ (612) $ 163 $ (1,186) $ (301)
Tax effect of reclassification adjustment for realized (gains) losses $ 0 $ 14 $ (3) $ 15