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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Other Commitments      
Unused commitments to extend credit $ 89,664   $ 93,432
Variable rate commitments 23,396 $ 34,631  
Fixed rate commitments 66,268 $ 58,801  
Remaining borrowing capacity 372,329   353,663
Required cash reserve 126   2,633
Letters of credit outstanding $ 8,162   9,460
Minimum      
Other Commitments      
Fixed interest rate (as a percent) 2.25% 2.69%  
Loan Commitments Terms   3 years  
Maximum      
Other Commitments      
Fixed interest rate (as a percent) 8.75% 8.59%  
Loan Commitments Terms   30 years  
Construction and development      
Other Commitments      
Unused commitments to extend credit $ 165,382   $ 181,477