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Loans and Allowance for Credit Losses - Classes of loans information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Provision for credit losses $ (2,615) $ (409) $ 1,000 $ 1,000 $ 545 $ 491 $ 314 $ 682 $ (1,024) $ 6,002 $ 2,032
ACL $ 33,222               $ 33,222 $ 25,139  
Consumer loans                      
Amortization period of loans                 5 years    
Consumer Loans, Home Equity Lines Of Credit                      
Maximum percentage of appraised value or purchase price that loans cannot exceed                 100.00%    
Amortization period of loans                 10 years    
Consumer Loans, Other Than Home Equity Lines Of Credit                      
Maximum percentage of appraised value or purchase price that loans cannot exceed                 100.00%    
Amortization period of loans                 60 months    
Commercial loans                      
Amortization period of loans                 5 years    
Amortization period of multi-family residential loans if balloon maturities                 1 year    
Secured by Properties Located Outside Lending Area                      
Loans Receivable                 $ 293,300    
Residential Real Estate                      
Fixed-rate and adjustable-rate mortgage (ARM) loans amortization period (in years)                 30 years    
Amortization period of multi-family residential loans if balloon maturities                 10 years    
Residential Real Estate | Minimum                      
Number of family residences | item                 1    
Residential Real Estate | Maximum                      
Number of family residences | item                 4    
Residential Real Estate | Single Family                      
Maximum percentage of appraised value or purchase price that loans cannot exceed                 90.00%    
Residential Real Estate | Multifamily                      
Maximum percentage of appraised value or purchase price that loans cannot exceed                 85.00%    
Amortization period of loans                 25 years    
Commercial                      
Amortization period of loans                 25 years    
Term of fixed interest applicability on loans                 10 years    
Term of variable interest applicability on loans                 7 years    
Agricultural real estate terms if 80% loan-to-value ratio                 25 years    
Agricultural real estate terms if 75% loan-to-value ratio                 30 years    
Loans Receivable                 $ 889,800    
Residential Real Estate                      
Amortization period of loans                 30 years    
Residential Real Estate | Minimum                      
Maturities of single-family residential construction loans                 6 months    
Residential Real Estate | Maximum                      
Maturities of single-family residential construction loans                 12 months    
Commercial Real Estate                      
Amortization period of loans                 25 years    
Construction Real Estate                      
Average term of construction loans                 8 months    
Construction Real Estate | Minimum                      
Maturities of multifamily or commercial construction loans                 12 months    
Construction Real Estate | Maximum                      
Maturities of multifamily or commercial construction loans                 24 months    
Modifications for the purpose of extending the maturity date | Construction Real Estate                      
Incremental period that the loan maturity can be extended to                 3 months    
Number of construction loans outstanding, for which a modification had been agreed to 48               48 77  
Construction loans outstanding, for which a modification had been agreed to $ 28,500               $ 28,500 $ 48,800