Derivative Financial Instruments - Master Netting Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts of Recognized Assets	$ 243,968	$ 142,975
Gross Amounts offset in the Statement of Financial Position	0	0
Gross Amounts of Recognized Liabilities	55,749	64,438
Net Amounts of Assets Presented in the Statement of Financial Position	243,968	142,975
Gross Assets Subject To Master Netting Arrangement Not Offset	(211,826)	(106,384)
Cash Collateral Received Subject to Master Netting Arrangements	(5,163)	(12,668)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	26,979	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	55,749	64,438
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(36,136)	(29,319)
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	19,613	35,119
Securities Sold under Agreements to Repurchase, Gross	0	0
Securities Purchased under Agreements to Resell, Gross	178,037	64,028
Securities Purchased under Agreements to Resell, Liability	0	0
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	178,037	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	5,163	12,668
Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	318	810
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative, Collateral, Obligation to Return Securities	318	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	51,050	57,644
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(41,296)	(44,285)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	22,222	22,738
Derivative, Collateral, Obligation to Return Cash	5,163	12,579
Derivative, Collateral, Right to Reclaim Securities	22,246	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	3,861	10,383
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(3,861)	(10,383)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	563	8,806
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative, Collateral, Right to Reclaim Securities	3,298	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	10,702	10,110
Derivative Asset, Fair Value, Gross Liability	0	0
Fair value, Liabilities	(10,592)	(9,770)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Obligation to Return Securities	10,686	10,091
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative, Collateral, Right to Reclaim Securities	10,592	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	65,931	78,947
Gross Amounts offset in the Statement of Financial Position	0	0
Gross Amounts of Recognized Liabilities	55,749	64,438
Net Amounts of Assets Presented in the Statement of Financial Position	65,931	78,947
Gross Assets Subject To Master Netting Arrangement Not Offset	(33,789)	(42,356)
Cash Collateral Received Subject to Master Netting Arrangements	(5,163)	(12,668)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	26,979	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	55,749	64,438
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(36,136)	(29,319)
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	19,613	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	318	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	51,050	57,644
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	23,665	22,327
Net Amounts of Liabilities Presented in the Statement of Financial Position	41,296	44,285
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	19,050	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	3,861	10,383
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	3,298	1,577
Net Amounts of Liabilities Presented in the Statement of Financial Position	3,861	10,383
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	563	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	10,702	10,110
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	16	19
Net Amounts of Liabilities Presented in the Statement of Financial Position	10,592	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	178,037	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	211,327	211,434
Derivative Asset, Fair Value, Gross Asset	124,233	131,123
Collateral	$ 0	$ 0