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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	$ 1,146,566	$ 925,774
JP Morgan Chase [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	657,452	445,942
Maximum Month-End Balance	783,528	445,942
Average Month-End Balance	660,741	261,261
Deutsche Bank Repurchase Facility [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	137,355	0
Maximum Month-End Balance	137,355	0
Average Month-End Balance	19,582	0
Goldman Sachs [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	40,657	45,928
Maximum Month-End Balance	45,928	52,524
Average Month-End Balance	43,505	45,665
UBS [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	133,899	133,899
Maximum Month-End Balance	133,899	133,899
Average Month-End Balance	133,899	133,899
Deutsche Bank [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	177,203	300,005
Maximum Month-End Balance	300,005	300,005
Average Month-End Balance	$ 246,773	$ 300,005