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Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]                  
Allowance for credit loss   $ 30,616 $ 84,306 $ 87,575 $ 84,306 $ 87,575 $ 86,062 $ 91,847 $ 79,739
Cumulative effect adjustment, decrease in retained earnings   (906,570) (982,014) (902,262) (982,014) (902,262) (966,780) (925,114) (885,686)
Threshold for loan analysis     1,000   1,000        
ASU 2016-13                  
Loans and Leases Receivable Disclosure [Line Items]                  
Allowance for credit loss $ 18,913                
Reclassification of financing receivable $ 481                
Retained Earnings                  
Loans and Leases Receivable Disclosure [Line Items]                  
Cumulative effect adjustment, decrease in retained earnings   (367,794) (446,948) (365,611) (446,948) (365,611) (427,575) (381,999) (354,645)
Common Stock                  
Loans and Leases Receivable Disclosure [Line Items]                  
Cumulative effect adjustment, decrease in retained earnings   (543,998) (531,339) (531,075) (531,339) (531,075) $ (531,038) $ (530,835) $ (530,422)
Impact of CECL Adoption                  
Loans and Leases Receivable Disclosure [Line Items]                  
Allowance for credit loss   18,913              
Tax portion of cumulative effect adjustment   5,449              
Cumulative effect adjustment, decrease in retained earnings   12,983              
Impact of CECL Adoption | Retained Earnings                  
Loans and Leases Receivable Disclosure [Line Items]                  
Cumulative effect adjustment, decrease in retained earnings   $ 12,983              
Financial Asset Originated                  
Loans and Leases Receivable Disclosure [Line Items]                  
Interest lost on nonaccrual loans     412 303 1,472 1,162      
Interest income on nonaccrual loans     $ 117 $ 187 $ 293 $ 321