Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

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Loans - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Loan
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Loan
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrued interest on loans $ 23,958,000   $ 23,958,000     $ 23,371,000    
Pledged loans receivable, carrying value 2,410,000,000   2,410,000,000     2,360,000,000    
Loans receivable 6,176,359,000   6,176,359,000     6,182,434,000    
Loans held for sale, at the lower of cost or fair value 10,467,000 $ 7,293,000 10,467,000 $ 7,293,000 $ 3,999,000 12,013,000 $ 3,652,000 $ 8,043,000
Gains on sale of second draw PPP loans     3,126,000 3,081,000        
Proceeds from sale of second draw PPP loans 23,490,000 19,943,000 49,076,000 49,643,000        
Interest income on nonaccrual loans 29,000 $ 30,000 38,000 $ 134,000        
Number of loan modified | Loan   0   0        
Other real estate owned ("OREO") 772,000   772,000     117,000    
Loans Pledged to Secure Advances                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Pledged loans receivable, carrying value 2,410,000,000   2,410,000,000     2,360,000,000    
Payment Protection Program                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans receivable 100,000   100,000     200,000    
Prepaid Expenses and Other Assets                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Other real estate owned ("OREO") 800,000   800,000     100,000    
Loans | Accrued Interest                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Accrued interest on loans $ 20,000,000.0   $ 20,000,000.0     $ 19,800,000