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Organization and Summary of Significant Accounting Policies (PBM Activites) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Recourse Liability [Roll Forward]          
MSA net carrying value     $ 627,000 $ 396,000  
Mortgage servicing assets, fair value     627,000 470,000 $ 357,000
Interest-only strips, fair value     $ 47,000 63,000  
Minimum          
Recourse Liability [Roll Forward]          
Refund of loan sale premium, term for loan repayment     3 months    
Maximum          
Recourse Liability [Roll Forward]          
Refund of loan sale premium, term for loan repayment     6 months    
Mortgage Partnership Finance (MPF) Program          
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance $ 242,000   $ 267,000    
Recourse liability, ending balance     242,000 267,000  
Other Investors          
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance 200,000   500,000    
Recourse liability, ending balance     200,000 500,000  
Provident Bank Mortgage (PBM)          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Repurchases of single-family loans     1,700,000 1,600,000.0 437,000
Payments for settlement of repurchase requests     500,000 22,000 700,000
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance 453,000   768,000 904,000  
Recourse provision (recovery)     155,000 (86,000)  
Net settlements in lieu of loan repurchases     (470,000) (50,000)  
Recourse liability, ending balance     453,000 768,000 904,000
Loan sale premium refunds     384,000 2,000,000 750,000
Unrealized gain on interest-only strips, net of tax     27,000 36,000  
Payment to Eliminate Repurchase Claims 400,000        
Provident Bank Mortgage (PBM) | Legacy Loan Investor          
Recourse Liability [Roll Forward]          
Net settlements in lieu of loan repurchases   $ (100,000)      
Provident Bank Mortgage (PBM) | Prepaid Expenses and Other Assets          
Recourse Liability [Roll Forward]          
Interest-only strips, fair value     47,000 63,000  
Provident Bank Mortgage (PBM) | Recourse Liability          
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance 214,000   653,000    
Recourse liability, ending balance     $ 214,000 653,000  
Provident Bank Mortgage (PBM) | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan repurchase requirement, period loan is past due     90 days    
Provident Bank Mortgage (PBM) | Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan repurchase requirement, period following loan funding date     120 days    
Provident Bank Mortgage (PBM) | Mortgage Partnership Finance (MPF) Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Recourse liability, portion covered by FHLB (percent)     0.04%    
Loans serviced under MPF program     $ 20,400,000 28,200,000  
Net loss on recourse liabilities     (15,000) 32,000 $ 139,000
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance 242,000   267,000    
Recourse liability, ending balance     242,000 267,000  
Provident Bank Mortgage (PBM) | Other Investors          
Recourse Liability [Roll Forward]          
Recourse liability, beginning balance $ 200,000   500,000    
Recourse liability, ending balance     $ 200,000 $ 500,000