Annual report [Section 13 and 15(d), not S-K Item 405]

Loans Receivable - Additional Information (Detail)

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Loans Receivable - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
USD ($)
Property
Dec. 31, 2023
USD ($)
Loan
Property
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable $ 6,251,377,000 $ 6,182,434,000  
Pledged loans receivable, carrying value 2,460,000,000    
Accrued interest on loans 22,937,000 23,371,000  
Loans held for sale, at the lower of cost or fair value 8,579,000 12,013,000 $ 8,043,000
Gains on sale of second draw PPP loans 6,112,000 5,701,000 9,478,000
Proceeds from sale of second draw PPP loans $ 139,172,000 $ 100,514,000  
Number of real estate properties | Property 1 1  
Other real estate owned ("OREO") $ 117,000 $ 117,000  
Number of loan modified | Loan   0  
Interest income on nonaccrual loans 100,000 $ 200,000  
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on nonaccrual loans     $ 0.1
Pass/Pass-Watch      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 4,777,714,000 4,783,314,000  
Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 139,613,000 21,765,000  
Classified      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable 25,683,000 31,367,000  
Loans Pledged to Secure Advances      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Pledged loans receivable, carrying value 2,460,000,000 2,360,000,000  
SBA Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale, at the lower of cost or fair value 8,600,000 12,000,000.0  
Loans | Accrued Interest      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest on loans $ 19,100,000 $ 19,800,000