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Loans and Allowance for Loan Losses (Loans) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 743,436 $ 713,345
Deferred loan origination fees and costs, net 245 249
Allowance for loan losses (9,620) (9,323)
Loans, net 734,061 704,271
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Deferred loan origination fees and costs, net 114 104
Multifamily residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Deferred loan origination fees and costs, net (29) (30)
Land and land development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Deferred loan origination fees and costs, net (4) (4)
Commercial business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Deferred loan origination fees and costs, net 288 275
Real estate mortgage [Member] | 1-4 family residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 196,810 195,274
Real estate mortgage [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 355,951 343,498
Real estate mortgage [Member] | Multifamily residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 27,731 28,814
Real estate mortgage [Member] | Residential construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 23,825 19,527
Real estate mortgage [Member] | Commercial construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 10,383 8,669
Real estate mortgage [Member] | Land and land development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 10,960 10,504
Real estate mortgage [Member] | Commercial business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 75,834 67,786
Consumer [Member] | Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 25,133 24,635
Consumer [Member] | Auto [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 12,007 11,720
Consumer [Member] | Other consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 4,802 $ 2,918