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Loans - Narrative, Loans (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Investment in non accrual loans $ 8,400,000 $ 9,200,000
Criteria days for delinquent status 90 days  
Impairment of loans $ 5,300,000 5,900,000
Principal balance of loans on non accrual status, less then 500,000  
Loans on non accrual status with principal balances below threshold definition of an impaired loan 3,200,000  
Loans held-for-sale, non-accrual 0 0
90 days or more past due and accruing 33,000 33,000
Impaired loans not written down $ 16,200,000 $ 16,600,000