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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
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 14,755   $ 66,734      
Total loans, at amortized cost 8,572,565   8,904,910      
Less: Allowance for credit losses (82,942) $ (82,786) (86,842) $ (88,995) $ (86,967) $ (85,117)
Total loans and lease finance receivables, net 8,489,623   8,818,068      
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 6,618,637   6,784,505      
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 272,001   270,619      
Total loans, at amortized cost 272,001   270,619      
SBA - Paycheck Protection Program (PPP) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 1,255   2,736      
Total loans, at amortized cost 1,255   2,736      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 936,489   969,895      
Total loans, at amortized cost 936,489   969,895      
Dairy And Livestock And Agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 342,445   412,891      
Total loans, at amortized cost 342,445   412,891      
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 67,585   73,590      
Total loans, at amortized cost 67,585   73,590      
Less: Allowance for credit losses (186) $ (186) (210) $ (246) $ (273) $ (296)
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 267,181   269,868      
Total loans, at amortized cost 267,181   269,868      
Consumer and Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 52,217   54,072      
Total loans, at amortized cost $ 52,217   $ 54,072