Derivative Financial Instruments - Master Netting Arrangements (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	$ 285,919	$ 142,975
Gross Amounts offset in the Statement of Financial Position	0	0
Gross Amounts of Recognized Liabilities	87,935	64,438
Net Amounts of Assets Presented in the Statement of Financial Position	285,919	142,975
Gross Assets Subject To Master Netting Arrangement Not Offset	(229,438)	(106,384)
Cash Collateral Received Subject to Master Netting Arrangements	(470)	(12,668)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	56,011	23,923
Gross Amounts offset in the Statement of Financial Position	0	0
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Securities Sold under Agreements to Repurchase, Asset	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	87,935	64,438
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(66,590)	(29,319)
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	21,345	35,119
Securities Sold under Agreements to Repurchase, Gross	0	0
Securities Purchased under Agreements to Resell, Gross	192,421	64,028
Securities Purchased under Agreements to Resell, Liability	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	192,421	64,028
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0	0
Collateral	470	12,668
Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	810
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative, Collateral, Obligation to Return Securities	0	721
Derivative, Collateral, Obligation to Return Cash	0	89
Foreign exchange forwards
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	76,882	57,644
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(71,201)	(44,285)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	24,960	22,738
Derivative, Collateral, Obligation to Return Cash	470	12,579
Derivative, Collateral, Right to Reclaim Securities	50,275	17,964
Derivative, Collateral, Right to Reclaim Cash	0	0
Client foreign currency options
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,961	10,383
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(4,969)	(10,383)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	419	8,806
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative, Collateral, Right to Reclaim Securities	4,550	1,585
Derivative, Collateral, Right to Reclaim Cash	0	0
Client interest rate derivatives
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	11,655	10,110
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(11,765)	(9,770)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	11,638	10,091
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative, Collateral, Right to Reclaim Securities	11,765	9,770
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	93,498	78,947
Gross Amounts offset in the Statement of Financial Position	0	0
Gross Amounts of Recognized Liabilities	87,935	64,438
Net Amounts of Assets Presented in the Statement of Financial Position	93,498	78,947
Gross Assets Subject To Master Netting Arrangement Not Offset	(37,017)	(42,356)
Cash Collateral Received Subject to Master Netting Arrangements	(470)	(12,668)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	56,011	23,923
Gross Amounts offset in the Statement of Financial Position	0	0
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	87,935	64,438
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(66,590)	(29,319)
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	21,345	35,119
Derivative | Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Net Amounts of Assets Presented in the Statement of Financial Position	0	810
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Derivative | Foreign exchange forwards
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Net Amounts of Assets Presented in the Statement of Financial Position	76,882	57,644
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	51,452	22,327
Net Amounts of Liabilities Presented in the Statement of Financial Position	71,201	44,285
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	20,926	26,321
Derivative | Client foreign currency options
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Net Amounts of Assets Presented in the Statement of Financial Position	4,961	10,383
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	4,542	1,577
Net Amounts of Liabilities Presented in the Statement of Financial Position	4,969	10,383
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	419	8,798
Derivative | Client interest rate derivatives
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Net Amounts of Assets Presented in the Statement of Financial Position	11,655	10,110
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	17	19
Net Amounts of Liabilities Presented in the Statement of Financial Position	11,765	9,770
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	0	0
Reverse Repurchase Securities Borrowing And Similar Arrangements
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Net Amounts of Assets Presented in the Statement of Financial Position	192,421	64,028
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	0	0
Other assets | Derivatives not designated as hedging instruments | Equity warrant assets | Other derivative instruments
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative, Notional Amount	215,655	211,434
Derivative Asset, Fair Value, Gross Asset	131,750	131,123
Collateral	$ 0	$ 0