Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Guarantees [Abstract]
Total of Loans Covered by Guarantees	$ 36,700	$ 27,600
Total of Guaranteed Loans Inquired About	600	900
Total Loans Indemnified to third parties	1,300	1,600
Loan Repurchase Guarantee Liability	$ 700	$ 900