Loans and Credit Quality - Analysis Of Loan Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of the year	$ 90	$ 117
Loans made	0	0
Repayments	90	27
Balance, end of year	$ 0	$ 90