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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Contract
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2018
USD ($)
Contract
Dec. 31, 2017
USD ($)
Contract
Jun. 30, 2018
Contract
Jun. 30, 2017
Contract
Troubled Debt Restructurings [Abstract]            
Number of contracts | Contract         0 0
TDR loans which have subsequently defaulted during the period | Contract 0 0 0 0    
Commercial Loans [Member]            
Troubled Debt Restructurings [Abstract]            
Number of contracts | Contract     1      
Pre-modification outstanding recorded investment     $ 127      
Post-modification outstanding recorded investment     131      
Current outstanding recorded investment $ 131   $ 131      
Consumer Loan [Member] | Home Equity [Member]            
Troubled Debt Restructurings [Abstract]            
Number of contracts | Contract       1    
Pre-modification outstanding recorded investment       $ 325    
Post-modification outstanding recorded investment       325    
Current outstanding recorded investment   $ 324   $ 324