Loans (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Abstract]
Risk rate loans, aggregate balance threshold	$ 2,500,000
Risk rate loans, loan balance threshold	500,000
Troubled debt restructurings included in impaired loans	27,500,000	$ 28,400,000
Current Troubled debt restructurings included in impaired loans	$ 27,400,000
Number of days past due to be considered in default	30 days