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Loans Held For Investment: Summary of Restructured Loans by Type, Net of Individually Evaluated Allowances (Details 9)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Financing Receivable, Impaired [Line Items]    
Number of modified loans | loan 10 11
Restructured Loans, Unpaid Principal Balance $ 5,304 $ 5,748
Restructured Loans, Related Charge-offs (406) (411)
Restructured Loans, Recorded Investment 4,898 5,337
Restructured Loans, Allowance for Loan Losses [1] (129) (157)
Restructured loans, Net Investment 4,769 5,180
Mortgage loans, Single-family    
Financing Receivable, Impaired [Line Items]    
Restructured Loans, With Related Allowance, Unpaid Principal Balance 2,221 2,228
Restructured Loans, Without a Related Allowance, Unpaid Principal Balance [2] 3,015 3,450
Restructured Loans, Unpaid Principal Balance 5,236 5,678
Restructured Loans, With Related Allowance, Related Charge-offs 0 0
Restructured Loans, Without a Related Allowance, Related Charge-offs [2] (406) (411)
Restructured Loans, Related Charge-offs (406) (411)
Restructured Loans, With a Related Allowance, Recorded Investment 2,221 2,228
Restructured Loans, Without a Related Allowance, Recorded Investment [2] 2,609 3,039
Restructured Loans, Recorded Investment 4,830 5,267
Restructured Loans, Allowance for Loan Losses [1] (125) (151)
Restructured loans, With a related allowance, Net Investment 2,096 2,077
Restructured Loans, Without a Related Allowance, Net Investment [2] 2,609 3,039
Restructured loans, Net Investment 4,705 5,116
Commercial business loans    
Financing Receivable, Impaired [Line Items]    
Restructured Loans, With Related Allowance, Unpaid Principal Balance 68 70
Restructured Loans, Unpaid Principal Balance 68 70
Restructured Loans, With Related Allowance, Related Charge-offs 0 0
Restructured Loans, Related Charge-offs 0 0
Restructured Loans, With a Related Allowance, Recorded Investment 68 70
Restructured Loans, Recorded Investment 68 70
Restructured Loans, Allowance for Loan Losses [1] (4) (6)
Restructured loans, With a related allowance, Net Investment 64 64
Restructured loans, Net Investment $ 64 $ 64
Substandard    
Financing Receivable, Impaired [Line Items]    
Number of modified loans | loan 9 9
[1] Consists of collectively and individually evaluated allowances, specifically assigned to the individual loan.
[2] There was no related allowance for loan losses because the loans have been charged-off to their fair value or the fair value of the collateral is higher than the loan balance.