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Segment Reporting - Net Income (GAAP) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($)
Segment Reporting |  |  |  |  |
Number of reportable operating segments | segment |  |  |  | 1 |
Net Income (GAAP) |  |  |  |  |
Interest income |  | $ 881,682 | $ 544,178 | $ 2,530,752 | $ 1,592,557
Interest expense |  | 281,985 | 192,698 | 808,560 | 546,882
Net interest income (a) |  | 599,697 | 351,480 | 1,722,192 | 1,045,675
Provision for credit losses |  | 5,085 | (6,971) | 113,152 | 9,604
Net interest income after provision for credit losses |  | 594,612 | 358,451 | 1,609,040 | 1,036,071
Total noninterest income |  |  |  |  |
Securities losses, net |  |  |  | (228,811) |
Gain on sale-leaseback, net of transaction costs | $ 229,300 |  |  | 229,279 |
Total noninterest income |  | 99,086 | 74,934 | 271,991 | 221,717
Total noninterest expense |  |  |  |  |
Salaries and employee benefits |  | 199,148 | 150,865 | 595,121 | 452,753
Occupancy expense |  | 40,874 | 22,242 | 117,874 | 67,272
Information services expense |  | 28,988 | 23,280 | 90,505 | 68,777
Professional fees |  | 4,994 | 4,017 | 14,361 | 11,038
Amortization of intangibles |  | 23,426 | 5,327 | 71,305 | 17,069
FDIC assessment and other regulatory charges |  | 8,374 | 7,482 | 31,101 | 23,787
Merger and branch consolidation related expense |  | 20,889 | 3,303 | 113,274 | 13,602
FDIC special assessment |  |  |  |  | 4,473
Total noninterest expense |  | 372,342 | 246,847 | 1,156,229 | 744,884
Income before income tax provision |  | 321,356 | 186,538 | 724,802 | 512,904
Income tax provision |  | 74,715 | 43,359 | 173,857 | 122,299
Net income (GAAP) |  | 246,641 | 143,179 | 550,945 | 390,605
General Banking Unit |  |  |  |  |
Net Income (GAAP) |  |  |  |  |
Interest income |  | 881,682 | 544,178 | 2,530,752 | 1,592,557
Interest expense |  | 281,985 | 192,698 | 808,560 | 546,882
Net interest income (a) |  | 599,697 | 351,480 | 1,722,192 | 1,045,675
Provision for credit losses |  | 5,085 | (6,971) | 113,152 | 9,604
Net interest income after provision for credit losses |  | 594,612 | 358,451 | 1,609,040 | 1,036,071
Total noninterest income |  |  |  |  |
Securities losses, net |  |  |  | (228,811) |
Gain on sale-leaseback, net of transaction costs |  |  |  | 229,279 |
Other operating noninterest income |  | 99,086 | 74,934 | 271,523 | 221,717
Total noninterest income |  | 99,086 | 74,934 | 271,991 | 221,717
Total noninterest expense |  |  |  |  |
Employee salaries |  | 136,630 | 107,363 | 408,253 | 317,503
Employee commissions |  | 15,656 | 10,781 | 41,210 | 32,142
Employee incentives |  | 32,612 | 24,070 | 95,001 | 72,422
Other salaries and benefits |  | 34,957 | 23,441 | 108,275 | 77,649
Deferred loan costs |  | (20,707) | (14,790) | (57,618) | (46,963)
Salaries and employee benefits |  | 199,148 | 150,865 | 595,121 | 452,753
Occupancy expense |  | 40,874 | 22,242 | 117,874 | 67,272
Information services expense |  | 28,988 | 23,280 | 90,505 | 68,777
Professional fees |  | 4,994 | 4,017 | 14,361 | 11,038
Amortization of intangibles |  | 23,426 | 5,327 | 71,305 | 17,069
Business development and staff related |  | 8,907 | 5,542 | 22,600 | 17,006
FDIC assessment and other regulatory charges |  | 8,374 | 7,482 | 31,101 | 23,787
Merger and branch consolidation related expense |  | 20,889 | 3,303 | 113,274 | 13,602
FDIC special assessment |  |  |  |  | 4,473
Other operating expense |  | 36,742 | 24,789 | 100,088 | 69,107
Total noninterest expense |  | 372,342 | 246,847 | 1,156,229 | 744,884
Income before income tax provision |  | 321,356 | 186,538 | 724,802 | 512,904
Income tax provision |  | 74,715 | 43,359 | 173,857 | 122,299
Net income (GAAP) |  | 246,641 | 143,179 | 550,945 | 390,605
Net Interest Margin, Non-Tax Equivalent ("Non-TE") (GAAP) |  |  |  |  |
Average interest earning assets (b) |  | $ 58,727,110 | $ 41,223,980 | $ 57,982,690 | $ 40,965,220
Net interest margin, non-TE ((a)/(b)) (GAAP) |  | 4.05% | 3.39% | 3.97% | 3.41%

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