Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative Assets
Gross Amounts of Recognized Assets	$ 224,861	$ 167,341
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	224,861	167,341
Financial Instruments (Collateral)	(138,177)	(89,112)
Cash Collateral Received	(19,068)	(17,430)
Net Amount	67,616	60,799
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	450,164	289,340
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	450,164	289,340
Financial Instruments (Collateral)	(450,164)	(289,340)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	675,025	456,681
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	675,025	456,681
Financial Instruments (Collateral)	(588,341)	(378,452)
Cash Collateral Received	(19,068)	(17,430)
Net Amount	67,616	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	142,605	114,546
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	142,605	114,546
Derivative Asset, Not Offset, Policy Election Deduction	(56,584)	(36,855)
Cash Collateral Received	(19,049)	(17,095)
Net Amount	66,972	60,596
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	2,986	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	2,986	1,308
Derivative Asset, Not Offset, Policy Election Deduction	(2,323)	(848)
Cash Collateral Received	(19)	(335)
Net Amount	644	125
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	79,270	28,811
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	79,270	28,811
Derivative Asset, Not Offset, Policy Election Deduction	(79,270)	(28,811)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0