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Loans Receivable and Allowance for Loan Losses - Related Parties (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Related party loans outstanding $ 39,300,000 $ 41,000,000
Decrease in related party loans due to principal pay-down of existing loans 1,700,000  
New related party loans 0  
Related party loans paid off 0  
Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Related party loans outstanding 38,800,000 40,000,000
Commercial Loan    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Related party loans outstanding $ 531,000 $ 1,000,000