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Allowance for Credit Losses (ACL) - Aggregated analysis of the changes in allowance for loan losses Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for credit losses        
Balance at beginning of period $ 457,309 $ 56,927    
Loans charged-off (16,899) (14,602)    
Recoveries of loans previously charged off 13,800 11,777    
Net (charge-offs) recoveries (3,099) (2,825)    
Provision for credit losses (152,403) 89,923    
Balance at end of period 301,807 457,309 $ 56,927  
As previously recorded by acquiree        
Allowance for credit losses        
Balance at beginning of period   61,991 55,798  
Loans charged-off     (9,775)  
Recoveries of loans previously charged off     3,914  
Net (charge-offs) recoveries     (5,861)  
Provision for credit losses     12,777  
Reduction due to loan removals     (723)  
Balance at end of period     61,991 $ 55,798
Non-acquired loans        
Allowance for credit losses        
Balance at beginning of period   56,927 51,194  
Loans charged-off     (6,917)  
Recoveries of loans previously charged off     3,367  
Provision for credit losses     9,283  
Balance at end of period     56,927 51,194
Non-acquired loans | As previously recorded by acquiree        
Allowance for credit losses        
Balance at beginning of period   56,927 51,194  
Loans charged-off       (6,917)
Recoveries of loans previously charged off       3,367
Net (charge-offs) recoveries       (3,550)
Provision for credit losses       9,283
Balance at end of period     56,927 51,194
Acquired non-credit impaired loans        
Allowance for credit losses        
Loans charged-off     (2,858)  
Recoveries of loans previously charged off     547  
Provision for credit losses     2,311  
Acquired non-credit impaired loans | As previously recorded by acquiree        
Allowance for credit losses        
Loans charged-off     (2,858)  
Recoveries of loans previously charged off     547  
Net (charge-offs) recoveries     (2,311)  
Provision for credit losses     2,311  
Acquired credit impaired loans        
Allowance for credit losses        
Balance at beginning of period $ 5,064   4,604  
Provision for credit losses   1,183    
Balance at end of period   5,064   4,604
Acquired credit impaired loans | As previously recorded by acquiree        
Allowance for credit losses        
Balance at beginning of period   $ 5,064 4,604  
Provision for credit losses     1,183  
Reduction due to loan removals     (723)  
Balance at end of period     $ 5,064 $ 4,604