Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.22.2.2
Loans - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Loan
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Loan
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Loan
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrued interest on loans $ 15,356,000   $ 15,356,000   $ 11,976,000      
Loans 5,800,991,000   5,800,991,000   5,151,541,000      
Loans held for sale, at the lower of cost or fair value 10,044,000 $ 17,881,000 10,044,000 $ 17,881,000 13,342,000 $ 18,528,000 $ 36,030,000 $ 8,568,000
Gains on sale of second draw PPP loans     7,545,000 13,475,000        
Proceeds from sale of second draw PPP loans 43,685,000 62,469,000 115,199,000 225,223,000        
Interest income on nonaccrual loans 0 0 0 0        
TDR loans receivable $ 1,600,000   $ 1,600,000   $ 2,900,000      
Loans default payment past due period     30 days          
Number of loans defaulted | Loan 0   0   0      
Loans Pledged to Secure Advances                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans $ 2,360,000,000   $ 2,360,000,000   $ 2,300,000,000      
Payment Protection Program                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans 1,000,000.0   1,000,000.0   3,000,000.0      
SBA Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans held for sale, at the lower of cost or fair value 10,000,000.0   10,000,000.0   13,300,000      
PPP Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Gains on sale of second draw PPP loans   300,000   3,000,000.0        
Proceeds from sale of second draw PPP loans   $ 14,600,000   $ 132,700,000        
Loans | Accrued Interest                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrued interest on loans $ 13,200,000   $ 13,200,000   $ 10,100,000