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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, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 68,836   $ 88,271      
Total 8,907,397   9,079,392      
Less: Allowance for credit losses (86,967) $ (86,540) (85,117) $ (80,222) $ (76,119) $ (65,019)
Net loans and lease finance receivables 8,820,430   8,994,275      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 956,242   948,683      
Total 956,242   948,683      
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 278,904   290,908      
Total 278,904   290,908      
SBA - Paycheck Protection Program (PPP) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 5,017   9,087      
Total 5,017   9,087      
Less: Allowance for credit losses 0 0 0 0 0 0
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 6,904,095   6,884,948      
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 263,201   266,024      
Total 263,201   266,024      
Dairy And Livestock And Agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 298,247   433,564      
Total 298,247   433,564      
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 77,867   81,126      
Total 77,867   81,126      
Less: Allowance for credit losses (273) $ (283) (296) $ (183) $ (152) $ (100)
Consumer and Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 54,988   76,781      
Total $ 54,988   $ 76,781