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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%

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