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Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Loans and Leases Receivable Disclosure [Line Items]                  
Allowance for credit loss   $ 30,616 $ 86,062 $ 79,739 $ 86,062 $ 79,739 $ 85,941 $ 91,847 $ 57,911
Cumulative effect adjustment, decrease in retained earnings   906,570 966,780 885,686 966,780 885,686 942,539 925,114 866,426
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   367,794 427,575 354,645 427,575 354,645 $ 408,211 $ 381,999 $ 356,935
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     524 428 1,060 859      
Interest income on nonaccrual loans     $ 159 $ 39 $ 176 $ 86