XML 48 R37.htm IDEA: XBRL DOCUMENT v3.22.1
Loans and Allowance for Loan Losses (Narrative) (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
contract
Mar. 31, 2021
USD ($)
contract
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases receivable, impaired, interest lost on nonaccrual loans $ 3,100,000 $ 3,400,000    
Interest income, cash basis method 347,000 622,000    
Total loans 40,169,150,000   $ 39,311,958,000  
Allowance for loan losses 414,956,000 563,214,000 427,597,000 $ 605,736,000
Reserve for unfunded commitments 47,300,000   41,900,000  
All financing receivable, allowance for credit loss 462,300,000   $ 469,500,000  
Allowance for credit loss, decrease $ (7,200,000)      
ACL to loans ratio 1.15%      
Decrease in ACL to loans ratio 0.0004      
Allowance for credit loss, reasonable and supportable forecast period 2 years      
Allowance for credit loss, straight-line basis historical period 1 year      
Downside bias 64.00%   43.00%  
Projected unemployment rate     3.70%  
Provision for (reversal of) credit losses $ 11,400,000 (18,575,000)    
Net chargeoff amount 18,600,000      
Financing receivable, allowance for credit loss, period increase (decrease) from increase in size of loan profile 3,800,000      
Financing receivable, purchase 181,300,000      
Recorded investment 41,643,000 $ 15,475,000    
Commitments to land additional funds to TDRs $ 0   $ 0  
Baseline        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Projected unemployment rate 3.40%      
Downside        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Projected unemployment rate 4.70%      
Asset Pledged as Collateral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 14,580,000,000   14,190,000,000  
Troubled Debt Restructuring That Subsequently Defaults        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of contracts | contract 0 0    
Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan substandard period (in days) 90 days      
Loss        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan charge off (in days) 120 days      
Total commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 20,352,325,000   $ 19,622,924,000  
Recorded investment 28,402,000 $ 7,449,000    
Total commercial and industrial | Small Business Administration (SBA), CARES Act, Paycheck Protection Program        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 202,900,000