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Segment Reporting - Net Income (GAAP) (Details) - USD ($)
 3 Months Ended
Feb. 28, 2025
Mar. 31, 2025
Mar. 31, 2024
Number of reportable operating segments   1  
Net Income (GAAP)      
Interest income   $ 808,566,000 $ 517,255,000
Interest expense   264,019,000 173,319,000
Net interest income (a)   544,547,000 343,936,000
Provision for credit losses   100,562,000 12,686,000
Net interest income after (recovery) provision for credit losses   443,985,000 331,250,000
Total noninterest income      
Securities losses, net   (228,811,000)  
Gain on sale-leaseback, net of transaction costs $ 229,300,000 229,279,000  
Total noninterest income   86,088,000 71,558,000
Total noninterest expense      
Salaries and employee benefits   195,811,000 150,453,000
Occupancy expense   35,493,000 22,577,000
Information services expense   31,362,000 22,353,000
Professional Fees   4,709,000 3,115,000
Amortization of intangibles   23,831,000 5,998,000
FDIC assessment and other regulatory charges   11,258,000 8,534,000
Merger and branch consolidation related expense   68,006,000 4,513,000
FDIC special assessment     3,854,000
Total noninterest expense   408,826,000 249,290,000
Income before income tax provision   121,247,000 153,518,000
Income tax provision   32,167,000 38,462,000
Net income (GAAP)   89,080,000 115,056,000
General Banking Unit      
Net Income (GAAP)      
Interest income   808,566,000 517,255,000
Interest expense   264,019,000 173,319,000
Net interest income (a)   544,547,000 343,936,000
Provision for credit losses   100,562,000 12,686,000
Net interest income after (recovery) provision for credit losses   443,985,000 331,250,000
Total noninterest income      
Securities losses, net   (228,811,000)  
Gain on sale-leaseback, net of transaction costs   229,279,000  
Other operating noninterest income   85,620,000 71,558,000
Total noninterest income   86,088,000 71,558,000
Total noninterest expense      
Employee salaries   135,728,000 105,415,000
Employee Commissions   11,276,000 10,240,000
Employee incentives   28,766,000 21,753,000
Other salaries and benefits   36,965,000 28,077,000
Deferred loan costs   (16,924,000) (15,032,000)
Salaries and employee benefits   195,811,000 150,453,000
Occupancy expense   35,493,000 22,577,000
Information services expense   31,362,000 22,353,000
Professional Fees   4,709,000 3,115,000
Amortization of intangibles   23,831,000 5,998,000
Business development and staff related   6,510,000 5,521,000
FDIC assessment and other regulatory charges   11,258,000 8,534,000
Merger and branch consolidation related expense   68,006,000 4,513,000
FDIC special assessment     3,854,000
Other operating expense   31,846,000 22,372,000
Total noninterest expense   408,826,000 249,290,000
Income before income tax provision   121,247,000 153,518,000
Income tax provision   32,167,000 38,462,000
Net income (GAAP)   89,080,000 115,056,000
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP)      
Average interest earning assets (b)   $ 57,497,453,000 $ 40,657,176,000
Net interest margin, non-TE ((a)/(b)) (GAAP)   3.84% 3.40%