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BUSINESS SEGMENTS (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
segment
$ / shares
Sep. 30, 2024
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     1    
Interest income $ 361,479 $ 332,113 $ 1,004,389 $ 997,928  
Total interest expense 159,567 173,568 458,328 511,345  
Net interest income 201,912 158,545 546,061 486,583  
Provision for credit losses 26,543 17,066 75,621 52,257  
Net interest income after provision for credit losses 175,369 141,479 470,440 434,326  
Total non-interest income 30,191 8,557 35,307 60,825  
Non-interest income:          
Salaries and employee benefits 48,723 47,717 137,245 128,689  
Technology, communication and bank operations 10,415 13,588 32,109 51,719  
Commercial lease depreciation 9,463 7,811 26,669 23,610  
Professional services 12,281 9,048 37,988 21,505  
Loan servicing 4,167 3,778 12,850 11,325  
Occupancy 4,370 2,987 11,333 8,454  
FDIC assessments, non-income taxes and regulatory fees 8,505 7,902 32,161 31,607  
Advertising and promotion 636 908 1,625 2,844  
Other 6,657 10,279 22,634 26,886  
Total non-interest expense 105,217 104,018 314,614 306,639  
Income before income tax expense (benefit) 100,343 46,018 191,133 188,512  
Income tax expense (benefit) 24,598 (725) 41,537 33,958  
Net income 75,745 46,743 149,596 154,554  
Preferred stock dividends 2,019 3,806 8,593 11,391  
Loss on redemption of preferred stock 0 0 1,908 0  
Net income available to common shareholders, basic 73,726 42,937 139,095 143,163  
Net income available to common shareholders, diluted $ 73,726 $ 42,937 $ 139,095 $ 143,163  
Basic earnings per common share (usd per share) | $ / shares $ 2.28 $ 1.36 $ 4.37 $ 4.54  
Diluted earnings per common share (usd per share) | $ / shares $ 2.20 $ 1.31 $ 4.24 $ 4.37  
Depreciation, occupancy and amortization of leasehold improvement $ 1,100 $ 500 $ 2,600 $ 1,600  
Total assets 24,260,163   24,260,163   $ 22,308,241
Operating Segments          
Non-interest income:          
Total assets 24,260,163   24,260,163   22,308,241
Segment Reconciling Items          
Non-interest income:          
Net income available to common shareholders, basic 0 0 0 0  
Net income available to common shareholders, diluted 0 $ 0 0 $ 0  
Total assets $ 0   $ 0   $ 0