Loans - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) category class component	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period Considered for Quarter Moving Average which Used in Calculating Historical Charge off	36 months
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	$ 3,000
Reasonable period to classify from troubled debt restructuring non performing loans to performing loans (in months)	6 months
Recorded investment	$ 8,836,000	$ 9,599,000
Real estate acquired through foreclosure	536,000	624,000
Mortgage loans in process of foreclosure, amount	$ 189,000	$ 167,000
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
Real Estate Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of categories in which real estate loans segmented | category	3