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Mergers and Acquisitions - Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2021
Feb. 29, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liabilities assumed          
Goodwill recognized     $ 471,380 $ 57,595 $ 166,832
Altabank          
Fair value of consideration transferred          
Fair value of Company shares issued $ 839,853        
Cash consideration 9        
Total fair value of consideration transferred 839,862        
Identifiable assets acquired          
Cash and cash equivalents 1,622,727        
Debt securities 6,658        
Loans receivable, net of ACL 1,901,950        
Core deposit Intangible 7,021        
Accrued income and other assets 121,926        
Total identifiable assets acquired 3,660,282        
Liabilities assumed          
Deposits 3,273,819        
Borrowings 0        
Accrued expenses and other liabilities 17,981        
Total liabilities assumed 3,291,800        
Total identifiable net assets 368,482        
Goodwill recognized $ 471,380        
Core deposit intangible, weighted average useful life (in years) 10 years        
State Bank of Arizona          
Fair value of consideration transferred          
Fair value of Company shares issued   $ 112,133      
Cash consideration   13,721      
Total fair value of consideration transferred   125,854      
Identifiable assets acquired          
Cash and cash equivalents   57,434      
Debt securities   142,174      
Loans receivable, net of ACL   451,653      
Core deposit Intangible   2,593      
Accrued income and other assets   33,971      
Total identifiable assets acquired   687,825      
Liabilities assumed          
Deposits   603,289      
Borrowings   10,904      
Accrued expenses and other liabilities   5,373      
Total liabilities assumed   619,566      
Total identifiable net assets   68,259      
Goodwill recognized   $ 57,595      
Core deposit intangible, weighted average useful life (in years)   10 years