Guarantees and Indemnifications Guarantees (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Guarantees [Abstract]
Total of Loans Covered by Guarantees	$ 79,600	$ 63,600
Total of Guaranteed Loans Inquired About	900	600
Total Loans Indemnified to third parties	1,000	1,000
Loan Repurchase Guarantee Liability	$ 600	$ 600