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Guarantees and Indemnifications Guarantees (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Guarantees [Abstract]    
Total of Loans Covered by Guarantees $ 37,600 $ 27,600
Total of Guaranteed Loans Inquired About 700 900
Total Loans Indemnified to third parties 1,400 1,600
Loan Repurchase Guarantee Liability $ 800 $ 900