Loan Sales and Servicing - Loans Transferred to Held for Sale and Loans Sold (Details) - Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans transferred from held for investment to held for sale	$ 764,022	$ 0
Loans and loans held for sale sold	$ 760,297	$ 8