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Business combination (Additional Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 07, 2022
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Business Acquisition [Line Items]        
Common stock, shares issued   141,626,059   135,526,025
Total assets   $ 17,539,137   $ 15,883,697
Cash and cash equivalents   1,653,039   1,732,548
Premises and equipment   53,435   49,096
Bank owned life insurance (BOLI)   259,254   251,570
Other assets   108,823   118,301
Other assets acquisition $ 197,100      
Goodwill   765,822   663,707
Fair value of liabilities assumed   257,979 $ 80,973  
Noninterest-bearing deposits   9,107,304   8,104,056
Interest-bearing deposits   5,380,474   $ 4,872,386
Suncrest Bank [Member]        
Business Acquisition [Line Items]        
Cash consideration 39,600 39,600    
Total assets 1,380,000      
Cash and cash equivalents 329,000      
Fair value of acquired investment securities 131,100 131,100    
Acquired net loans at fair value 765,900 765,900    
Premises and equipment 6,100      
Bank owned life insurance (BOLI) 9,000 9,000    
Other assets 33,700      
Loans recorded at a fair value 224,700      
Loans net of a discount 13,100      
Loans credit discount 8,600      
Deposit premium   3,900    
Goodwill   102,100    
Fair value of liabilities assumed 1,190,000      
Noninterest-bearing deposits 512,800      
Interest-bearing deposits 669,800      
Other liabilities 6,200      
Non-recurring merger related expenses   $ 5,600    
Suncrest Bank [Member] | Core Deposits [Member]        
Business Acquisition [Line Items]        
Deposit premium 3,900      
Goodwill $ 102,100