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Loans and Allowance for Loan Losses (Impaired Loans Individually Evaluated For Impairment) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment $ 11,590   $ 11,781
Loans with no related allowance recorded, Unpaid Principal Balance 12,280   12,392
Loans with no related allowance recorded, Average Recorded Investment 11,688 $ 11,302  
Loans with no related allowance recorded, Interest Income Recognized 119 103  
Loans with an allowance recorded, Recorded Investment 1,816   1,546
Loans with an allowance recorded, Unpaid Principal Balance 1,880   1,703
Loans with an allowance recorded, Related Allowance 695   511
Loans with an allowance recorded, Average Recorded Investment 1,681 336  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 13,406   13,327
Total, Unpaid Principal Balance 14,160   14,095
Total, Related Allowance 695   511
Total, Average Recorded Investment 13,369 11,638  
Total, Interest Income Recognized 119 103  
Residential real estate [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 4,654   4,833
Loans with no related allowance recorded, Unpaid Principal Balance 5,135   5,285
Loans with no related allowance recorded, Average Recorded Investment 4,744 4,751  
Loans with no related allowance recorded, Interest Income Recognized 34 36  
Loans with an allowance recorded, Recorded Investment 270   274
Loans with an allowance recorded, Unpaid Principal Balance 281   282
Loans with an allowance recorded, Related Allowance 2   7
Loans with an allowance recorded, Average Recorded Investment 272 235  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 4,924   5,107
Total, Unpaid Principal Balance 5,416   5,567
Total, Related Allowance 2   7
Total, Average Recorded Investment 5,016 4,986  
Total, Interest Income Recognized 34 36  
Commercial real estate [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 6,525   6,568
Loans with no related allowance recorded, Unpaid Principal Balance 6,714   6,715
Loans with no related allowance recorded, Average Recorded Investment 6,547 6,147  
Loans with no related allowance recorded, Interest Income Recognized 82 64  
Loans with an allowance recorded, Recorded Investment 1,323   1,151
Loans with an allowance recorded, Unpaid Principal Balance 1,376   1,293
Loans with an allowance recorded, Related Allowance 654   492
Loans with an allowance recorded, Average Recorded Investment 1,237 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 7,848   7,719
Total, Unpaid Principal Balance 8,090   8,008
Total, Related Allowance 654   492
Total, Average Recorded Investment 7,784 6,147  
Total, Interest Income Recognized 82 64  
Multifamily [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 0   0
Loans with no related allowance recorded, Unpaid Principal Balance 0   0
Loans with no related allowance recorded, Average Recorded Investment 0 0  
Loans with no related allowance recorded, Interest Income Recognized 0 0  
Loans with an allowance recorded, Recorded Investment 0   0
Loans with an allowance recorded, Unpaid Principal Balance 0   0
Loans with an allowance recorded, Related Allowance 0   0
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 0   0
Total, Unpaid Principal Balance 0   0
Total, Related Allowance 0   0
Total, Average Recorded Investment 0 0  
Total, Interest Income Recognized 0 0  
Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 0   0
Loans with no related allowance recorded, Unpaid Principal Balance 0   0
Loans with no related allowance recorded, Average Recorded Investment 0 0  
Loans with no related allowance recorded, Interest Income Recognized 0 0  
Loans with an allowance recorded, Recorded Investment 0   0
Loans with an allowance recorded, Unpaid Principal Balance 0   0
Loans with an allowance recorded, Related Allowance 0   0
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 0   0
Total, Unpaid Principal Balance 0   0
Total, Related Allowance 0   0
Total, Average Recorded Investment 0 0  
Total, Interest Income Recognized 0 0  
Land and land development [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 0   27
Loans with no related allowance recorded, Unpaid Principal Balance 0   28
Loans with no related allowance recorded, Average Recorded Investment 14 30  
Loans with no related allowance recorded, Interest Income Recognized 0 0  
Loans with an allowance recorded, Recorded Investment 0   0
Loans with an allowance recorded, Unpaid Principal Balance 0   0
Loans with an allowance recorded, Related Allowance 0   0
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 0   27
Total, Unpaid Principal Balance 0   28
Total, Related Allowance 0   0
Total, Average Recorded Investment 14 30  
Total, Interest Income Recognized 0 0  
Commercial business [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 294   231
Loans with no related allowance recorded, Unpaid Principal Balance 305   241
Loans with no related allowance recorded, Average Recorded Investment 263 274  
Loans with no related allowance recorded, Interest Income Recognized 2 2  
Loans with an allowance recorded, Recorded Investment 0   0
Loans with an allowance recorded, Unpaid Principal Balance 0   0
Loans with an allowance recorded, Related Allowance 0   0
Loans with an allowance recorded, Average Recorded Investment 0 0  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 294   231
Total, Unpaid Principal Balance 305   241
Total, Related Allowance 0   0
Total, Average Recorded Investment 263 274  
Total, Interest Income Recognized 2 2  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Loans with no related allowance recorded, Recorded Investment 117   122
Loans with no related allowance recorded, Unpaid Principal Balance 126   123
Loans with no related allowance recorded, Average Recorded Investment 120 100  
Loans with no related allowance recorded, Interest Income Recognized 1 1  
Loans with an allowance recorded, Recorded Investment 223   121
Loans with an allowance recorded, Unpaid Principal Balance 223   128
Loans with an allowance recorded, Related Allowance 39   12
Loans with an allowance recorded, Average Recorded Investment 172 101  
Loans with an allowance recorded, Interest Income Recognized 0 0  
Total, Recorded Investment 340   243
Total, Unpaid Principal Balance 349   251
Total, Related Allowance 39   $ 12
Total, Average Recorded Investment 292 201  
Total, Interest Income Recognized $ 1 $ 1