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Commitments and Contingencies - Small Business Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Loss Contingencies [Line Items]    
Carrying amount included in other assets $ 488,944 $ 426,137
Amount of future funding commitments 283,212 250,733
Permanent and short-term construction loans and letter of credit commitments 177,998 204,391
Funded portion of permanent and short-term loans and letters of credit 234,166 104,315
Letters of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 220,622 183,463
Amounts participated 25,700 26,100
Commitments to fund commercial and industrial loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 9,970,733 9,595,793
Commitments to fund commercial real estate, construction, and land development loans    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 3,629,531 3,593,171
Commitments under home equity lines of credit    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 2,156,641 1,805,869
Unused credit card lines    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 461,443 473,582
Other loan commitments    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 742,976 604,353
Guarantee Obligations    
Loss Contingencies [Line Items]    
Total letters of credit and unfunded lending commitments 17,181,946 16,256,231
Permanent and Short-term Construction Loans and Letter of Credit Commitments    
Loss Contingencies [Line Items]    
Amounts participated 4,700 6,000
Funded Portion of Permanent and Short-term Loans and Letters of Credit    
Loss Contingencies [Line Items]    
Amounts participated $ 6,900 $ 3,000