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Segment Reporting - Net Income (GAAP) (Details) - USD ($)
 3 Months Ended
Feb. 28, 2025
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting      
Number of reportable operating segments   1  
Net Income (GAAP)      
Interest income   $ 816,829,000 $ 808,566,000
Interest expense   255,224,000 264,019,000
Net interest income (a)   561,605,000 544,547,000
Provision for credit losses   10,808,000 100,562,000
Net interest income after provision for credit losses   550,797,000 443,985,000
Total noninterest income      
Securities (losses) gain, net     (228,811,000)
Gain on sale-leaseback, net of transaction costs $ 229,300,000   229,279,000
Total noninterest income   100,098,000 86,088,000
Total noninterest expense      
Salaries and employee benefits   205,653,000 195,811,000
Occupancy expense   42,302,000 35,493,000
Information services expense   29,704,000 31,362,000
Professional fees   5,239,000 4,709,000
Amortization of intangibles   21,304,000 23,831,000
FDIC assessment and other regulatory charges   10,257,000 11,258,000
Merger and branch consolidation related expense     68,006,000
Total noninterest expense   359,524,000 408,826,000
Income before income tax provision   291,371,000 121,247,000
Income tax provision   65,551,000 32,167,000
Net income (GAAP)   225,820,000 89,080,000
General Banking Unit      
Net Income (GAAP)      
Interest income   816,829,000 808,566,000
Interest expense   255,224,000 264,019,000
Net interest income (a)   561,605,000 544,547,000
Provision for credit losses   10,808,000 100,562,000
Net interest income after provision for credit losses   550,797,000 443,985,000
Total noninterest income      
Securities (losses) gain, net     (228,811,000)
Gain on sale-leaseback, net of transaction costs     229,279,000
Other operating noninterest income   100,098,000 85,620,000
Total noninterest income   100,098,000 86,088,000
Total noninterest expense      
Employee salaries   142,471,000 135,728,000
Employee commissions   16,112,000 11,276,000
Employee incentives   29,657,000 28,766,000
Other salaries and benefits   37,569,000 36,965,000
Deferred loan costs   (20,156,000) (16,924,000)
Salaries and employee benefits   205,653,000 195,811,000
Occupancy expense   42,302,000 35,493,000
Information services expense   29,704,000 31,362,000
Professional fees   5,239,000 4,709,000
Amortization of intangibles   21,304,000 23,831,000
Business development and staff related   11,362,000 6,510,000
FDIC assessment and other regulatory charges   10,257,000 11,258,000
Merger and branch consolidation related expense     68,006,000
Other operating expense   33,703,000 31,846,000
Total noninterest expense   359,524,000 408,826,000
Income before income tax provision   291,371,000 121,247,000
Income tax provision   65,551,000 32,167,000
Net income (GAAP)   225,820,000 89,080,000
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP)      
Average interest earning assets (b)   $ 60,201,176,000 $ 57,497,453,000
Net interest margin, non-TE ((a)/(b)) (GAAP)   3.78% 3.84%