Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative Assets
Gross Amounts of Recognized Assets	$ 319,815	$ 167,341
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	319,815	167,341
Financial Instruments (Collateral)	(158,568)	(89,112)
Cash Collateral Received	(63,162)	(17,430)
Net Amount	98,085	60,799
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	401,758	289,340
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	401,758	289,340
Financial Instruments (Collateral)	(401,758)	(289,340)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	721,573	456,681
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	721,573	456,681
Financial Instruments (Collateral)	(560,326)	(378,452)
Cash Collateral Received	(63,162)	(17,430)
Net Amount	98,085	60,799
Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	0	22,676
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	0	22,676
Derivative Asset, Not Offset, Policy Election Deduction	0	(22,598)
Cash Collateral Received	0	0
Net Amount	0	78
Foreign exchange forwards
Derivative Assets
Gross Amounts of Recognized Assets	232,549	114,546
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	232,549	114,546
Derivative Asset, Not Offset, Policy Election Deduction	(76,009)	(36,855)
Cash Collateral Received	(59,693)	(17,095)
Net Amount	96,847	60,596
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	6,723	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	6,723	1,308
Derivative Asset, Not Offset, Policy Election Deduction	(2,016)	(848)
Cash Collateral Received	(3,469)	(335)
Net Amount	1,238	125
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	80,543	28,811
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	80,543	28,811
Derivative Asset, Not Offset, Policy Election Deduction	(80,543)	(28,811)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0