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Business Segments (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Segment Reporting Information [Line Items]      
Number of reportable segments (segment) | segment 1    
Interest income $ 1,327,834 $ 1,367,360 $ 885,373
Total interest expense 673,430 679,911 261,653
Net interest income 654,404 687,449 623,720
Provision for credit losses 73,451 74,611 60,066
Net interest income after provision for credit losses 580,953 612,838 563,654
Total non-interest income 60,434 70,565 32,272
Non-interest income:      
Salaries and employee benefits 175,836 133,275 112,365
Technology, communication and bank operations 65,154 65,550 84,998
Commercial lease depreciation 32,543 29,898 22,978
Professional services 34,978 35,177 27,465
Loan servicing 15,909 17,075 15,023
Occupancy 11,789 10,070 13,606
FDIC assessments, non-income taxes, and regulatory fees 41,684 35,036 8,869
Advertising and promotion 4,489 3,095 2,541
Legal settlement expense 0 4,096 0
Other 34,632 19,391 16,784
Total non-interest expense 417,014 352,663 304,629
Income before income tax expense 224,373 330,740 291,297
Income tax expense 42,904 80,597 63,263
Net income 181,469 250,143 228,034
Preferred stock dividends 15,040 14,695 9,632
Net income available to common shareholders 166,429 235,448 218,402
Net income available to common shareholders $ 166,429 $ 235,448 $ 218,402
Basic earnings per common share (usd per share) | $ / shares $ 5.28 $ 7.49 $ 6.69
Diluted earnings per common share (usd per share) | $ / shares $ 5.09 $ 7.32 $ 6.51
Depreciation, occupancy and amortization of leasehold improvement $ 2,200 $ 2,200 $ 3,300
Total assets 22,308,241 21,316,265  
Operating Segments      
Non-interest income:      
Total assets 22,308,241 21,316,265  
Adjustments and reconciling items      
Non-interest income:      
Net income available to common shareholders 0 0 0
Net income available to common shareholders 0 0 $ 0
Total assets $ 0 $ 0