Contingent Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Contingent Liabilities [Abstract]
Litigation settlement amount				$ 2,200
Notification costs and other estimated expenses				100
Amount paid on litigation settlement	$ 2,200
Amount recorded as settlement expense				$ 2,300
Receivables balance decline		$ 8,200
Provision for loss reimbursement on sold loans		10	$ 30
Reserve for loss reimbursement on sold mortgage loans		$ 700			$ 700