v3.25.2
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%