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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
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 52,227   $ 66,734      
Total loans, at amortized cost 8,681,846   8,904,910      
Less: Allowance for credit losses (82,786) $ (82,817) (86,842) $ (86,967) $ (86,540) $ (85,117)
Net loans and lease finance receivables 8,599,060   8,818,068      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 956,184   969,895      
Total loans, at amortized cost 956,184   969,895      
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 267,938   270,619      
Total loans, at amortized cost 267,938         270,619
SBA - Paycheck Protection Program (PPP) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 1,757   2,736      
Total loans, at amortized cost 1,757   2,736      
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 6,664,925   6,784,505      
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 267,593   269,868      
Total loans, at amortized cost 267,593   269,868      
Dairy And Livestock And Agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 350,562   412,891      
Total loans, at amortized cost 350,562   412,891      
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 70,889   73,590      
Total loans, at amortized cost 70,889   73,590      
Less: Allowance for credit losses (186) $ (194) (210) $ (273) $ (283) $ (296)
Consumer and Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 49,771   54,072      
Total loans, at amortized cost $ 49,771   $ 54,072