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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%