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Loans Held For Investment: Narrative 2 (Details)
$ / shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
property
loan
$ / shares
Sep. 30, 2016
USD ($)
property
$ / shares
Jun. 30, 2016
loan
Jun. 30, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Properties Acquired in Settlement of Loans | property 0 3    
Number of Previously Foreclosed Properties Sold | property 2 1    
Average investment in non-performing loans $ 7,922,000 $ 11,480,000    
Interest income, non-performing loans, cash basis 160,000 69,000    
Interest lost on non-performing Loans $ 49,000 $ 39,000    
Number of modified loans | loan 12     10
Number of loans modified, extended beyond initial maturity | loan 0      
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0     $ 0
Number of Loans Modified as Troubled Debt Restructurings in Default | $ / shares $ 0 $ 0    
Loans receivable, restructured loans, accrual status $ 3,457,000     3,126,000
Loans receivable, restructured loans, nonaccrual status 996,000     506,000
Restructured loans $ 4,453,000     $ 3,632,000
Percent of Total Restructured Loans on Current Status 32.00%     46.00%
Substandard [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of modified loans | loan 10   9  
Loans receivable, restructured loans, accrual status $ 3,500,000     $ 3,100,000
Current [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Restructured loans $ 1,400,000     1,700,000
Restructured loans on accrual status | Special Mention [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of modified loans | loan 2   1  
Loans receivable, restructured loans, nonaccrual status $ 996,000     $ 506,000
Collected and Applied to Principal Balance [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Interest lost on non-performing Loans $ 94,000 $ 67,000    
In Default and Required and Additional Provision [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans Modified as Troubled Debt Restructurings | loan 0