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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Components of Loans and Lease Finance Receivables, Including PCI Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross $ 8,935,357      
Construction 83,992 $ 88,271    
Total loans 8,942,489 9,079,392    
Less: Allowance for credit losses (86,540) (85,117) $ (76,119) $ (65,019)
Net loans and lease finance receivables 8,855,949 8,994,275    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 898,167 948,683    
Total loans 898,167 948,683    
SBA [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 283,464 290,908    
Total loans 283,464 290,908    
SBA - Paycheck Protection Program (PPP) [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 5,824 9,087    
Total loans 5,824 9,087    
Less: Allowance for credit losses 0 0 0 0
Commercial real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 6,950,302 6,884,948    
SFR mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 262,324 266,024    
Total loans 262,324 266,024    
Dairy And Livestock And Agribusiness [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 307,820 433,564    
Total loans 307,820 433,564    
Municipal Lease Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 79,552 81,126    
Total loans 79,552 81,126    
Less: Allowance for credit losses (283) (296) $ (152) $ (100)
Consumer and other loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 71,044 76,781    
Total loans $ 71,044 $ 76,781