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Loans - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Contract
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2019
USD ($)
Contract
Sep. 30, 2018
USD ($)
Contract
Dec. 31, 2018
USD ($)
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]          
Loans $ 0   $ 0   $ 0
Recorded investment in troubled debt restructurings 336,000   336,000   343,000
Specific reserves to customers whose loan terms have been modified in troubled debt restructurings $ 336,000   $ 336,000   $ 343,000
Loans identified as trouble debt restructurings | Contract 0 0 0 0  
Financing receivable, modifications, subsequent default, recorded investment $ 0 $ 0 $ 0 $ 0