Loans Receivable and Allowance for Loan Losses - Impaired Financing Receivable Performance Status (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	$ 513,744	$ 507,954
Total Residential and Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	154,201	168,246
Total Residential and Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	2,112	2,884
Total Residential and Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	152,089	165,362
Residential Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	153,769	167,706
Residential Mortgage | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	2,112	2,884
Residential Mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	151,657	164,822
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	432	540
Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	0	0
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivables	$ 432	$ 540