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Loans and Allowance for Loan Losses, Impaired Loans By Loan Portfolio Class (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
With no related allowance recorded [Abstract]      
Recorded investment $ 1,356   $ 1,181
Unpaid principal 1,356   1,181
Average recorded investment 1,235 $ 1,401  
Interest income recognized 8 10  
With an allowance recorded [Abstract]      
Recorded investment 2,632   2,071
Unpaid principal 2,632   2,071
Related allowance 528   436
Average recorded investment 2,467 1,830  
Interest income recognized 14 18  
Total impaired [Abstract]      
Recorded investment 3,988   3,252
Unpaid principal 3,988   3,252
Related allowance 528   436
Average recorded investment 3,702 3,231  
Interest income recognized 22 28  
Residential Real Estate [Member] | Residential Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded investment     0
Unpaid principal     0
Average recorded investment   375  
Interest income recognized   0  
With an allowance recorded [Abstract]      
Recorded investment 1,706   1,455
Unpaid principal 1,706   1,455
Related allowance 335   278
Average recorded investment 1,536 1,345  
Interest income recognized 11 12  
Total impaired [Abstract]      
Recorded investment 1,706   1,455
Unpaid principal 1,706   1,455
Related allowance 335   278
Average recorded investment 1,536 1,720  
Interest income recognized 11 12  
Commercial Real Estate [Member] | Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded investment 805   809
Unpaid principal 805   809
Average recorded investment 807 1,021  
Interest income recognized 8 10  
With an allowance recorded [Abstract]      
Recorded investment 425   440
Unpaid principal 425   440
Related allowance 108   135
Average recorded investment 430 402  
Interest income recognized 0 4  
Total impaired [Abstract]      
Recorded investment 1,230   1,249
Unpaid principal 1,230   1,249
Related allowance 108   135
Average recorded investment 1,237 1,423  
Interest income recognized 8 14  
Commercial Real Estate [Member] | Construction [Member]      
With an allowance recorded [Abstract]      
Recorded investment 176   176
Unpaid principal 176   176
Related allowance 22   23
Average recorded investment 176 0  
Interest income recognized 0 0  
Total impaired [Abstract]      
Recorded investment 176   176
Unpaid principal 176   176
Related allowance 22   23
Average recorded investment 176 0  
Interest income recognized 0 0  
Consumer Loan [Member] | Home Equity [Member]      
With no related allowance recorded [Abstract]      
Recorded investment 181   186
Unpaid principal 181   186
Average recorded investment 183 5  
Interest income recognized 0 0  
With an allowance recorded [Abstract]      
Recorded investment 325    
Unpaid principal 325    
Related allowance 63   0
Average recorded investment 325    
Interest income recognized 3    
Total impaired [Abstract]      
Recorded investment 506   186
Unpaid principal 506   186
Related allowance 63   0
Average recorded investment 508 5  
Interest income recognized 3 0  
Commercial Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded investment 370   186
Unpaid principal 370   186
Average recorded investment 245 0  
Interest income recognized 0 0  
With an allowance recorded [Abstract]      
Recorded investment     0
Unpaid principal     0
Related allowance 0   0
Average recorded investment   83  
Interest income recognized   2  
Total impaired [Abstract]      
Recorded investment 370   186
Unpaid principal 370   186
Related allowance 0   $ 0
Average recorded investment 245 83  
Interest income recognized $ 0 $ 2