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Loans and Allowance for Loan Losses, Impaired Loans By Loan Portfolio Class (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
With no related allowance recorded [Abstract]          
Recorded investment $ 1,341   $ 1,341   $ 1,181
Unpaid principal 1,341   1,341   1,181
Average recorded investment 1,345 $ 1,154 1,290 $ 1,224  
Interest income recognized 7 5 15 15  
With an allowance recorded [Abstract]          
Recorded investment 2,732   2,732   2,071
Unpaid principal 2,732   2,732   2,071
Related allowance 533   533   436
Average recorded investment 2,586 2,068 2,526 1,899  
Interest income recognized 20 19 34 37  
Total impaired [Abstract]          
Recorded investment 4,073   4,073   3,252
Unpaid principal 4,073   4,073   3,252
Related allowance 533   533   436
Average recorded investment 3,931 3,222 3,816 3,123  
Interest income recognized 27 24 49 52  
Residential Real Estate [Member] | Residential Real Estate [Member]          
With no related allowance recorded [Abstract]          
Recorded investment         0
Unpaid principal         0
Average recorded investment   266   266  
Interest income recognized   0   0  
With an allowance recorded [Abstract]          
Recorded investment 1,819   1,819   1,455
Unpaid principal 1,819   1,819   1,455
Related allowance 348   348   278
Average recorded investment 1,668 1,238 1,602 1,241  
Interest income recognized 15 12 26 24  
Total impaired [Abstract]          
Recorded investment 1,819   1,819   1,455
Unpaid principal 1,819   1,819   1,455
Related allowance 348   348   278
Average recorded investment 1,668 1,504 1,602 1,507  
Interest income recognized 15 12 26 24  
Commercial Real Estate [Member] | Real Estate [Member]          
With no related allowance recorded [Abstract]          
Recorded investment 801   801   809
Unpaid principal 801   801   809
Average recorded investment 803 821 805 921  
Interest income recognized 7 4 15 14  
With an allowance recorded [Abstract]          
Recorded investment 413   413   440
Unpaid principal 413   413   440
Related allowance 101   101   135
Average recorded investment 418 749 424 576  
Interest income recognized 0 7 0 11  
Total impaired [Abstract]          
Recorded investment 1,214   1,214   1,249
Unpaid principal 1,214   1,214   1,249
Related allowance 101   101   135
Average recorded investment 1,221 1,570 1,229 1,497  
Interest income recognized 7 11 15 25  
Commercial Real Estate [Member] | Construction [Member]          
With an allowance recorded [Abstract]          
Recorded investment 176   176   176
Unpaid principal 176   176   176
Related allowance 22   22   23
Average recorded investment 176 0 176 0  
Interest income recognized 0 0 0 0  
Total impaired [Abstract]          
Recorded investment 176   176   176
Unpaid principal 176   176   176
Related allowance 22   22   23
Average recorded investment 176 0 176 0  
Interest income recognized 0 0 0 0  
Consumer Loan [Member] | Home Equity [Member]          
With no related allowance recorded [Abstract]          
Recorded investment 181   181   186
Unpaid principal 181   181   186
Average recorded investment 181 2 182 4  
Interest income recognized 0 0 0 0  
With an allowance recorded [Abstract]          
Recorded investment 324   324    
Unpaid principal 324   324    
Related allowance 62   62   0
Average recorded investment 324   324    
Interest income recognized 5   8    
Total impaired [Abstract]          
Recorded investment 505   505   186
Unpaid principal 505   505   186
Related allowance 62   62   0
Average recorded investment 505 2 506 4  
Interest income recognized 5 0 8 0  
Commercial Loans [Member]          
With no related allowance recorded [Abstract]          
Recorded investment 359   359   186
Unpaid principal 359   359   186
Average recorded investment 361 65 303 33  
Interest income recognized 0 1 0 1  
With an allowance recorded [Abstract]          
Recorded investment         0
Unpaid principal         0
Related allowance 0   0   0
Average recorded investment   81   82  
Interest income recognized   0   2  
Total impaired [Abstract]          
Recorded investment 359   359   186
Unpaid principal 359   359   186
Related allowance 0   0   $ 0
Average recorded investment 361 146 303 115  
Interest income recognized $ 0 $ 1 $ 0 $ 3