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Loans Held for Sale Summary of Changes in Valuation Allowance of Loans Held for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 10,064 $ 14,658 $ 49,676
Provision 3,109 3,599 (400)
Transfer from Liability for indemnification obligations (Other liabilities) 3,246 2,368 1,180
Sales of loans (9,415) (10,208) (37,776)
Other 314 (353) 1,978
Ending balance $ 7,318 $ 10,064 $ 14,658