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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 07, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Other assets acquisition $ 197,100      
Total assets   $ 16,476,540 $ 15,883,697  
Total cash and cash equivalents   203,461 1,732,548  
Premises and equipment, net   46,698 49,096  
Other assets   108,946 118,301  
Bank owned life insurance (BOLI)   255,528 251,570  
Interest-bearing   4,671,881 4,872,386  
Noninterest-bearing deposits   8,164,364 8,104,056  
Goodwill   765,822 663,707 $ 663,707
Merger related expenses   6,013 $ 962 $ 0
Suncrest Bank [Member]        
Business Acquisition [Line Items]        
Cash consideration 39,600      
Total assets 1,380,000      
Total cash and cash equivalents 329,000      
Premises and equipment, net 6,100      
Deposits premium 3,900      
fair value of acquired investment securities 131,100      
Loans receivable at fair value 224,700      
Fair value of liabilities assumed 1,190,000      
Other assets 33,700      
Non-recurring merger related expenses   $ 6,000    
Bank owned life insurance (BOLI) 9,000      
Loans credit discount 8,600      
Other liabilities 6,200      
Interest-bearing 669,800      
Noninterest-bearing deposits 512,800      
Loan net of discount 13,100      
Debt Securities Carrying Amount Net 765,900      
Goodwill $ 102,100