Loans - Activity in Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Activity in allowance for loan losses
Allowance for loan losses at the beginning of the period	$ 6,029	$ 6,031
Provision for loan losses	(761)	317
Allowance for loan losses at the end of the period	5,268	6,348
Recorded investment in loans related to the allowance for loan loss	351,220	315,881
Activity in loan portfolio
Balance at the beginning of the period	6,263,517	6,300,285
Acquisitions/origination/additional funding	674,712	1,063,108
Capitalized Interest	21,290	17,490
Basis of loans sold	(354,601)	(567,033)
Loan maturities/principal repayments	(195,073)	(320,379)
Discount accretion/premium amortization	(8,696)	(10,179)
Changes in fair value	6,891	21,131
Unrealized foreign currency remeasurement loss	(12,984)	(45,907)
Change in loan loss allowance, net	761	(317)
Transfer to/from other asset classifications	17,182	1,038
Balance at the end of the period	$ 6,430,391	$ 6,479,595