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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, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Jun. 30, 2017
Contract
Jun. 30, 2016
Contract
Financing Receivable, Modifications [Line Items]            
Number of contracts | Contract 0 0   0 0 0
Pre-modification outstanding recorded investment       $ 0    
Post-modification outstanding recorded investment       0    
Current outstanding recorded investment   $ 0   $ 0    
TDR loans which have subsequently defaulted during the period | Contract 0 0 0 0    
Consumer Loan [Member] | Home Equity [Member]            
Financing Receivable, Modifications [Line Items]            
Number of contracts | Contract     1      
Pre-modification outstanding recorded investment     $ 325      
Post-modification outstanding recorded investment     325      
Current outstanding recorded investment $ 324   $ 324