Borrowings - Long Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Long-term borrowings	$ 579,101	$ 0
Weighted Average Interest Rate	2.10%
Average Balance	$ 253,759
Floating rate borrowings
Line of Credit Facility [Line Items]
Long-term borrowings	$ 337,098
Weighted Average Interest Rate	1.38%
Average Balance	$ 151,373
Fixed rate borrowings
Line of Credit Facility [Line Items]
Long-term borrowings	$ 242,003
Weighted Average Interest Rate	3.11%
Average Balance	$ 102,386