Contingent Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loss Contingencies [Line Items]
Litigation settlement expense					$ 2,200
Notification costs and other estimated expenses					100
Receivables balance decline	$ 22,500		$ 22,500
Provision for loss reimbursement on sold loans	20	$ 50	70	$ 30
Reserve for loss reimbursement on sold mortgage loans	$ 600		$ 600		$ 600