Loans - Narrative, Loans (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Investment in non accrual loans	$ 6,400,000	$ 5,500,000
Criteria days for delinquent status	90 days
Impairment of loans	$ 3,300,000	3,100,000
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	3,100,000	2,400,000
Loans held-for-sale, non-accrual	0	0
90 days or more past due and accruing	0	28,000
Impaired loans not written down	$ 13,200,000	$ 14,500,000