Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative Assets
Gross Amounts of Recognized Assets	$ 284,831	$ 167,341
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	284,831	167,341
Financial Instruments	(144,882)	(89,112)
Cash Collateral Received	(20,553)	(17,430)
Net Amount	119,396	60,799
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	226,847	289,340
Gross Amounts offset in the Statement of Financial Position	0	0
Securities purchased under agreements to resell	226,847	289,340
Financial Instruments	(226,847)	(289,340)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	511,678	456,681
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	511,678	456,681
Financial Instruments	(371,729)	(378,452)
Cash Collateral Received	(20,553)	(17,430)
Net Amount	119,396	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
Financial Instruments	0	(22,598)
Cash Collateral Received	0	0
Net Amount	0	78
Foreign exchange forwards
Derivative Assets
Gross Amounts of Recognized Assets	215,275	114,546
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	215,275	114,546
Financial Instruments	(75,983)	(36,855)
Cash Collateral Received	(20,550)	(17,095)
Net Amount	118,742	60,596
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	1,702	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	1,702	1,308
Financial Instruments	(1,045)	(848)
Cash Collateral Received	(3)	(335)
Net Amount	654	125
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	67,854	28,811
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	67,854	28,811
Financial Instruments	(67,854)	(28,811)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0