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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, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Construction $ 58,806 $ 66,734    
Total loans, at amortized cost 8,770,713 8,904,910    
Less: Allowance for credit losses (82,817) (86,842) $ (86,540) $ (85,117)
Net loans and lease finance receivables 8,687,896 8,818,068    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 963,120 969,895    
Total loans, at amortized cost 963,120 969,895    
SBA [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 268,320 270,619    
Total loans, at amortized cost 268,320 270,619    
SBA - Paycheck Protection Program (PPP) [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 2,249 2,736    
Total loans, at amortized cost 2,249 2,736    
Commercial real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 6,720,538 6,784,505    
SFR mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 276,475 269,868    
Total loans, at amortized cost 276,475 269,868    
Dairy And Livestock And Agribusiness [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 351,624 412,891    
Total loans, at amortized cost 351,624 412,891    
Municipal Lease Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 72,032 73,590    
Total loans, at amortized cost 72,032 73,590    
Less: Allowance for credit losses (194) (210) $ (283) $ (296)
Consumer and other loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 57,549 54,072    
Total loans, at amortized cost $ 57,549 $ 54,072