Derivative Financial Instruments - Balance Sheet Offsetting, Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative Liabilities
Gross Amounts of Recognized Liabilities	$ 137,781	$ 137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	137,781	137,984
Financial Instruments (Collateral)	(50,506)	(56,521)
Cash Collateral Pledged	(37,816)	(38,913)
Net Amount	49,459	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	137,781	137,984
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	137,781	137,984
Financial Instruments (Collateral)	(50,506)	(56,521)
Cash Collateral Pledged	(37,816)	(38,913)
Net Amount	49,459	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	109,237	96,899
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	109,237	96,899
Derivative Liability, Not Offset, Policy Election Deduction	(49,862)	(33,314)
Cash Collateral Pledged	(12,918)	(22,030)
Net Amount	46,457	41,555
Client foreign currency options
Derivative Liabilities
Gross Amounts of Recognized Liabilities	2,986	1,308
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	2,986	1,308
Derivative Liability, Not Offset, Policy Election Deduction	(644)	(531)
Cash Collateral Pledged	0	0
Net Amount	2,342	777
Client interest rate derivatives
Derivative Liabilities
Gross Amounts of Recognized Liabilities	25,558	14,154
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	25,558	14,154
Derivative Liability, Not Offset, Policy Election Deduction	0	0
Cash Collateral Pledged	(24,898)	(13,936)
Net Amount	$ 660	$ 218