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Segment Reporting - Net Income (GAAP) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Number of reportable operating segments |  |  |  | 1 |
Net Income (GAAP) |  |  |  |  |
Interest income |  | $ 840,504,000 | $ 531,124,000 | $ 1,649,070,000 | $ 1,048,379,000
Interest expense |  | 262,556,000 | 180,865,000 | 526,575,000 | 354,184,000
Net interest income (a) |  | 577,948,000 | 350,259,000 | 1,122,495,000 | 694,195,000
Provision for credit losses |  | 7,505,000 | 3,889,000 | 108,067,000 | 16,575,000
Net interest income after (recovery) provision for credit losses |  | 570,443,000 | 346,370,000 | 1,014,428,000 | 677,620,000
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 |  | 86,817,000 | 75,225,000 | 172,905,000 | 146,783,000
Total noninterest expense |  |  |  |  |
Salaries and employee benefits |  | 200,162,000 | 151,435,000 | 395,973,000 | 301,888,000
Occupancy expense |  | 41,507,000 | 22,453,000 | 77,000,000 | 45,030,000
Information services expense |  | 30,155,000 | 23,144,000 | 61,517,000 | 45,497,000
Professional Fees |  | 4,658,000 | 3,906,000 | 9,367,000 | 7,021,000
Amortization of intangibles |  | 24,048,000 | 5,744,000 | 47,879,000 | 11,742,000
FDIC assessment and other regulatory charges |  | 11,469,000 | 7,771,000 | 22,727,000 | 16,305,000
Merger and branch consolidation related expense |  | 24,379,000 | 5,785,000 | 92,385,000 | 10,298,000
FDIC special assessment |  |  | 619,000 |  | 4,473,000
Total noninterest expense |  | 375,061,000 | 248,747,000 | 783,887,000 | 498,037,000
Income before income tax provision |  | 282,199,000 | 172,848,000 | 403,446,000 | 326,366,000
Income tax provision |  | 66,975,000 | 40,478,000 | 99,142,000 | 78,940,000
Net income (GAAP) |  | 215,224,000 | 132,370,000 | 304,304,000 | 247,426,000
General Banking Unit |  |  |  |  |
Net Income (GAAP) |  |  |  |  |
Interest income |  | 840,504,000 | 531,124,000 | 1,649,070,000 | 1,048,379,000
Interest expense |  | 262,556,000 | 180,865,000 | 526,575,000 | 354,184,000
Net interest income (a) |  | 577,948,000 | 350,259,000 | 1,122,495,000 | 694,195,000
Provision for credit losses |  | 7,505,000 | 3,889,000 | 108,067,000 | 16,575,000
Net interest income after (recovery) provision for credit losses |  | 570,443,000 | 346,370,000 | 1,014,428,000 | 677,620,000
Total noninterest income |  |  |  |  |
Securities losses, net |  |  |  | (228,811,000) |
Gain on sale-leaseback, net of transaction costs |  |  |  | 229,279,000 |
Other operating noninterest income |  | 86,817,000 | 75,225,000 | 172,437,000 | 146,783,000
Total noninterest income |  | 86,817,000 | 75,225,000 | 172,905,000 | 146,783,000
Total noninterest expense |  |  |  |  |
Employee salaries |  | 135,895,000 | 104,725,000 | 271,623,000 | 210,140,000
Employee Commissions |  | 14,278,000 | 11,122,000 | 25,554,000 | 21,361,000
Employee incentives |  | 33,623,000 | 26,598,000 | 62,389,000 | 48,351,000
Other salaries and benefits |  | 36,353,000 | 26,131,000 | 73,318,000 | 54,208,000
Deferred loan costs |  | (19,987,000) | (17,141,000) | (36,911,000) | (32,172,000)
Salaries and employee benefits |  | 200,162,000 | 151,435,000 | 395,973,000 | 301,888,000
Occupancy expense |  | 41,507,000 | 22,453,000 | 77,000,000 | 45,030,000
Information services expense |  | 30,155,000 | 23,144,000 | 61,517,000 | 45,497,000
Professional Fees |  | 4,658,000 | 3,906,000 | 9,367,000 | 7,021,000
Amortization of intangibles |  | 24,048,000 | 5,744,000 | 47,879,000 | 11,742,000
Business development and staff related |  | 7,182,000 | 5,942,000 | 13,692,000 | 11,464,000
FDIC assessment and other regulatory charges |  | 11,469,000 | 7,771,000 | 22,727,000 | 16,305,000
Merger and branch consolidation related expense |  | 24,379,000 | 5,785,000 | 92,385,000 | 10,298,000
FDIC special assessment |  |  | 619,000 |  | 4,473,000
Other operating expense |  | 31,501,000 | 21,948,000 | 63,347,000 | 44,319,000
Total noninterest expense |  | 375,061,000 | 248,747,000 | 783,887,000 | 498,037,000
Income before income tax provision |  | 282,199,000 | 172,848,000 | 403,446,000 | 326,366,000
Income tax provision |  | 66,975,000 | 40,478,000 | 99,142,000 | 78,940,000
Net income (GAAP) |  | 215,224,000 | 132,370,000 | 304,304,000 | 247,426,000
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP) |  |  |  |  |
Average interest earning assets (b) |  | $ 57,710,001,000 | $ 41,011,662,000 | $ 57,604,313,000 | $ 40,834,418,000
Net interest margin, non-TE ((a)/(b)) (GAAP) |  | 4.02% | 3.43% | 3.93% | 3.42%

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