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Loans and Leases - Allowance for Loan and Lease Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   $ 635,737 $ 594,741 $ 301,187
Initial allowance for PCD loans and leases   0 0 88,045
Provision (benefit)   220,743 143,209 272,797
Charge-offs   (176,470) (117,212) (87,522)
Recoveries   9,556 9,126 20,234
Balance, end of period   689,566 635,737 594,741
Individually evaluated for credit losses   68,706 48,194 47,234
Collectively evaluated for credit losses   620,860 587,543 547,507
Sterling | Financial Asset Acquired with Credit Deterioration        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Charge-offs $ (48,300)      
Adoption of ASU No. 2022-02        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   0 5,873 0
Balance, end of period     0 5,873
Commercial portfolio        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   577,663 533,125 257,877
Initial allowance for PCD loans and leases   0 0 78,376
Provision (benefit)   225,599 138,057 268,295
Charge-offs   (171,460) (104,509) (82,860)
Recoveries   4,069 3,286 11,437
Balance, end of period   635,871 577,663 533,125
Individually evaluated for credit losses   68,013 43,559 34,793
Collectively evaluated for credit losses   567,858 534,104 498,332
Commercial portfolio | Adoption of ASU No. 2022-02        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   0 7,704 0
Balance, end of period     0 7,704
Consumer portfolio        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   58,074 61,616 43,310
Initial allowance for PCD loans and leases   0 0 9,669
Provision (benefit)   (4,856) 5,152 4,502
Charge-offs   (5,010) (12,703) (4,662)
Recoveries   5,487 5,840 8,797
Balance, end of period   53,695 58,074 61,616
Individually evaluated for credit losses   693 4,635 12,441
Collectively evaluated for credit losses   53,002 53,439 49,175
Consumer portfolio | Adoption of ASU No. 2022-02        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period   $ 0 (1,831) 0
Balance, end of period     $ 0 $ (1,831)