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Income Taxes Income Taxes (Effective Tax Rate) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Tax Reconciliation [Abstract]                      
Federal income tax statutory rate, Amount                 $ 1,551 $ 2,988 $ 4,496
State income tax, Amount                 429 629 902
Changes in taxes resulting from:                      
Bank-owned life insurance, Amount                 (50) (57) (65)
Non-deductible expenses, Amount                 30 43 45
Non-deductible stock-based compensation, Amount                 15 6 (6)
Other, Amount                 (155) 0 0
Provision for income taxes $ 870 $ 667 $ 2,067 $ (208) $ 560 $ 690 $ 1,095 $ 1,264 $ 3,396 $ 3,609 $ 5,372
Effective Income Tax Rate Reconciliation [Abstract]                      
Federal income tax statutory rate, Tax Rate                 28.10% 33.90% 35.00%
State income tax, Tax Rate                 7.80% 7.10% 7.00%
Changes in taxes resulting from:                      
Bank-owned life insurance, Tax Rate                 0.90% 0.70% 0.50%
Non-deductible expenses, Tax Rate                 0.50% 0.50% 0.40%
Non-deductible stock-based compensation, Tax Rate                 (0.20%) (0.10%) 0.10%
Other, Tax Rate                 (2.80%) 0.00% 0.00%
Effective income tax, Tax Rate                 61.40% 40.90% 41.80%
Excess Tax Benefit from Share-based Compensation, Operating Activities                 $ (189) $ 0 $ 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent                 (3.40%) 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                 $ 1,765 $ 0 $ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent                 31.90% 0.00% 0.00%