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Loans - Additional Information (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
category
class
loan
contract
component
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable individually evaluated for impairment minimum amount $ 100,000  
Individually evaluated for impairment $ 100,000  
Payment delays limit (in days) 90 days  
Impaired financing receivable commitment to lend $ 35,000  
Reasonable period to classify from troubled debt restructuring non performing loans to performing loans (in months) 6 months  
Number of contracts | contract 2  
Recorded investment $ 9,115,000 $ 9,048,000
Real estate acquired through foreclosure 558,000 422,000
Mortgage loans in process of foreclosure, amount $ 386,000 $ 378,000
Number of categories considered not criticized and rated as, Pass | category 6  
Minimum period after which loans are considered as substandard (in days) 90 days  
Number of components that represents the allowance for loan losses | component 2  
Number of classes that groups of loans are collectively evaluated for impairment | class 2  
Period considered for quarter moving average which used in calculating historical charge off (in months) 36 months  
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of contracts | loan 3  
Real estate mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of categories in which real estate loans segmented | category 3