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Loans Receivable - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Interest income recognized on impaired loans $ 318 $ 371
Loans 883,757 869,730
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans $ 4,950 $ 3,366