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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 07, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]        
Other assets acquisition $ 197,100      
Total assets   $ 16,020,993 $ 16,476,540  
Total cash and cash equivalents   281,285 203,461  
Premises and equipment, net   44,709 46,698  
Other assets   127,187 108,946  
Bank owned life insurance (BOLI)   308,706 255,528  
Interest-bearing   4,227,467 4,671,881  
Noninterest-bearing deposits   7,206,175 8,164,364  
Goodwill   765,822 765,822 $ 663,707
Merger related expenses   $ 0 6,013 $ 962
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