Borrowings - Stated Maturity and Maturity to Call Date (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Stated maturity, 2024	$ 3,106,548
Stated maturity, 2025	3,976,567
Stated maturity, 2026	2,990,961
Stated maturity, 2027	743,512
Stated maturity, 2028	642,845
Stated maturity, 2029 and after	1,051,808
Total principal amount, maturity to call date	12,512,241
Hedge accounting adjustments	(1,306)
Total principal amount, after adjustments	12,510,935
Brokered CDs
Debt Instrument [Line Items]
Stated maturity, 2024	2,385,510
Stated maturity, 2025	2,768,889
Stated maturity, 2026	1,832,740
Stated maturity, 2027	151,131
Stated maturity, 2028	146,459
Stated maturity, 2029 and after	0
Total principal amount, maturity to call date	7,284,729
Hedge accounting adjustments	(1,306)
Total principal amount, after adjustments	7,283,423
Unsecured Debt
Debt Instrument [Line Items]
Stated maturity, 2024	0
Stated maturity, 2025	497,567
Stated maturity, 2026	494,633
Stated maturity, 2027	0
Stated maturity, 2028	0
Stated maturity, 2029 and after	0
Total principal amount, maturity to call date	992,200
Hedge accounting adjustments	0
Total principal amount, after adjustments	992,200
Secured Borrowings
Debt Instrument [Line Items]
Stated maturity, 2024	721,038
Stated maturity, 2025	710,111
Stated maturity, 2026	663,588
Stated maturity, 2027	592,381
Stated maturity, 2028	496,386
Stated maturity, 2029 and after	1,051,808
Total principal amount, maturity to call date	4,235,312
Hedge accounting adjustments	0
Total principal amount, after adjustments	$ 4,235,312