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Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans held for investment   $ 4,846 $ 0 $ 0
Allowance for credit losses   155,937 204,809 116,539
COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses   39,900    
Total Past Due | COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Additional provision   9,700    
Loans held for investment   65,500    
Non-PCD        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Additional provision   (6,877) 86,532  
Allowance for credit losses   132,065 161,015 85,044
Net charge-offs   52,987 76,182  
PCD        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Additional provision   7,760 7,185  
Allowance for credit losses   23,872 43,794 31,495
Net charge-offs   33,559 $ 49,004  
Cumulative effect adjustment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase (decrease) recorded to allowance for credit losses $ 89,700      
Cumulative effect adjustment | Non-PCD        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase (decrease) recorded to allowance for credit losses $ 39,200      
Percent of total loan portfolio 70.00%      
Allowance for credit losses       39,198
Cumulative effect adjustment | PCD        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase (decrease) recorded to allowance for credit losses $ 50,500      
Percent of total loan portfolio 30.00%      
Allowance for credit losses       $ 50,522
Loan sales        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase (decrease) recorded to allowance for credit losses   (20,400)    
Additional provision   9,700    
Net charge-offs   $ 30,100