BORROWINGS - FHLB and FRB Advances (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
FHLB advances	$ 1,025,000
Amount
2024	0
2025	200,000
2026	200,000
2027	450,000
2028	100,000
Thereafter	75,000
FHLB advances	$ 1,025,000
Rate
2024	0
2025	4.45%
2026	4.32%
2027	3.70%
2028	4.19%
Thereafter	6.05%
Total maximum borrowing capacity with the FHLB	$ 3,345,182	$ 3,474,347
Total maximum borrowing capacity with the FRB	4,283,486	3,436,000
Qualifying loans and securities serving as collateral against FHLB and FRB advances	12,215,920	11,889,120
Qualifying Assets Pledged as Collateral
Rate
Qualifying loans and securities serving as collateral against FHLB and FRB advances	9,481,379	8,575,137
FHLB advances
Debt Instrument [Line Items]
Total long-term debt	$ 1,018,349	$ 1,203,207
FHLB advances, rate	4.19%	3.91%
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB	$ (6,700)	$ 3,200
FHLB Advance Due March 2028
Debt Instrument [Line Items]
FHLB advances	950,000
Amount
FHLB advances	950,000
FHLB Advance Due June 2029
Debt Instrument [Line Items]
FHLB advances	75,000
Amount
FHLB advances	$ 75,000

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