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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance to total loans ratio 117.00%   99.00%  
Provision for loan losses $ 1,500,000 $ 475,000 $ 889,000 $ 2,069,000
Non-accrual loans, interest income lost 894,000 967,000    
Loans returned to accrual, interest income 459,000 1,100,000    
Loans Receivable >90 Days and Accruing 0 795,000   795,000
Troubled debt restructurings, amount $ 216,102   $ 1,378,000  
Troubled debt restructurings, number | loan 1   3  
Financing receivables $ 2,190,677,000 2,203,315,000   2,203,315,000
IA Bancorp [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value of loans acquired 1,400,000 3,800,000   3,800,000
Loss [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables 0      
Substandard [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables 9,900,000      
Substandard [Member] | Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivables 9,900,000      
Acquired loans with deteriorated credit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Provision for loan losses (59,000)   $ (56,000) (111,000)
Loans Receivable >90 Days and Accruing  
Financing receivables $ 3,202,000 $ 5,610,000   $ 5,610,000