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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, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 63,022   $ 88,271      
Total loans, at amortized cost 8,877,632   9,079,392      
Less: Allowance for credit losses (88,995) $ (86,967) (85,117) $ (82,601) $ (80,222) $ (65,019)
Total loans and lease finance receivables, net 8,788,637   8,994,275      
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 6,843,059   6,884,948      
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 283,124   290,908      
SBA - Paycheck Protection Program (PPP) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 3,233   9,087      
Less: Allowance for credit losses 0 0 0  
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 938,064   948,683      
Dairy And Livestock And Agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 351,463   433,564      
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 75,621   81,126      
Less: Allowance for credit losses (246) $ (273) (296) $ (239) $ (183) $ (100)
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 268,171   266,024      
Consumer and other loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross $ 51,875   $ 76,781