Derivative Financial Instruments - Balance Sheet Offsetting, Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 227,424	$ 137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	227,424	137,984
Financial Instruments (Collateral)	(70,036)	(56,521)
Cash Collateral Pledged	(38,527)	(38,913)
Net Amount	118,861	42,550
Repurchase, securities lending, and similar arrangements
Securities Sold under Agreements to Repurchase, Gross	0	0
Securities Sold under Agreements to Repurchase, Asset	0	0
Securities Sold under Agreements to Repurchase	0	0
Financial Instruments (Collateral)	0	0
Cash Collateral Pledged	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	227,424	137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	227,424	137,984
Financial Instruments (Collateral)	(70,036)	(56,521)
Cash Collateral Pledged	(38,527)	(38,913)
Net Amount	118,861	42,550
Interest rate swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	0	25,623
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	25,623
Derivative Liability, Not Offset, Policy Election Deduction	0	(22,676)
Cash Collateral Pledged	0	(2,947)
Net Amount	0	0
Foreign exchange forwards
Derivative Liabilities
Gross Amounts of Recognized Liabilities	189,168	96,899
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	189,168	96,899
Derivative Liability, Not Offset, Policy Election Deduction	(68,027)	(33,314)
Cash Collateral Pledged	(7,442)	(22,030)
Net Amount	113,699	41,555
Client foreign currency options
Derivative Liabilities
Gross Amounts of Recognized Liabilities	6,723	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	6,723	1,308
Derivative Liability, Not Offset, Policy Election Deduction	(2,009)	(531)
Cash Collateral Pledged	0	0
Net Amount	4,714	777
Client interest rate derivatives
Derivative Liabilities
Gross Amounts of Recognized Liabilities	31,533	14,154
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	31,533	14,154
Derivative Liability, Not Offset, Policy Election Deduction	0	0
Cash Collateral Pledged	(31,085)	(13,936)
Net Amount	$ 448	$ 218