Derivative Financial Instruments - Balance Sheet Offsetting, Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 237,479	$ 137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	237,479	137,984
Financial Instruments	(85,192)	(56,521)
Cash Collateral Pledged	(71,475)	(38,913)
Net Amount	80,812	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	0	0
Cash Collateral Pledged	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	237,479	137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	237,479	137,984
Financial Instruments	(85,192)	(56,521)
Cash Collateral Pledged	(71,475)	(38,913)
Net Amount	80,812	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
Financial Instruments	0	(22,676)
Cash Collateral Pledged	0	(2,947)
Net Amount	0	0
Foreign exchange forwards
Derivative Liabilities
Gross Amounts of Recognized Liabilities	209,131	96,899
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	209,131	96,899
Financial Instruments	(84,547)	(33,314)
Cash Collateral Pledged	(45,367)	(22,030)
Net Amount	79,217	41,555
Client foreign currency options
Derivative Liabilities
Gross Amounts of Recognized Liabilities	1,702	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	1,702	1,308
Financial Instruments	(645)	(531)
Cash Collateral Pledged	(8)	0
Net Amount	1,049	777
Client interest rate derivatives
Derivative Liabilities
Gross Amounts of Recognized Liabilities	26,646	14,154
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	26,646	14,154
Financial Instruments	0	0
Cash Collateral Pledged	(26,100)	(13,936)
Net Amount	$ 546	$ 218