Derivative Financial Instruments - Balance Sheet Offsetting, Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative Assets
Gross Amounts of Recognized Assets	$ 167,341	$ 108,901
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	167,341	108,901
Financial Instruments	(89,112)	(47,242)
Cash Collateral Received	(17,430)	(11,998)
Net Amount	60,799	49,661
Reverse repurchase, securities borrowing, and similar arrangements
Gross Amounts of Recognized Assets	289,340	123,611
Gross Amounts offset in the Statement of Financial Position	0	0
Securities purchased under agreements to resell	289,340	123,611
Financial Instruments	(289,340)	(123,611)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	456,681	232,512
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	456,681	232,512
Financial Instruments	(378,452)	(170,853)
Cash Collateral Received	(17,430)	(11,998)
Net Amount	60,799	49,661
Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	22,676
Gross Amounts offset in the Statement of Financial Position	0
Net Amounts of Assets Presented in the Statement of Financial Position	22,676
Financial Instruments	(22,598)
Cash Collateral Received	0
Net Amount	78
Foreign exchange forwards
Derivative Assets
Gross Amounts of Recognized Assets	114,546	98,643
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	114,546	98,643
Financial Instruments	(36,855)	(38,213)
Cash Collateral Received	(17,095)	(11,825)
Net Amount	60,596	48,605
Client foreign currency options
Derivative Assets
Gross Amounts of Recognized Assets	1,308	1,759
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	1,308	1,759
Financial Instruments	(848)	(613)
Cash Collateral Received	(335)	(90)
Net Amount	125	1,056
Client interest rate derivatives
Derivative Assets
Gross Amounts of Recognized Assets	28,811	8,499
Gross Amounts offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	28,811	8,499
Financial Instruments	(28,811)	(8,416)
Cash Collateral Received	0	(83)
Net Amount	$ 0	$ 0