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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, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Construction $ 77,398   $ 85,145    
Total loans, at amortized cost 7,849,520   8,348,808    
Less: Allowance for credit losses (65,364) $ (69,342) (93,692) $ (93,869) $ (93,983)
Total loans and lease finance receivables, net 7,784,156   8,255,116    
Commercial And Industrial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 769,977   812,062    
SBA [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 307,533   303,896    
SBA - Paycheck Protection Program (PPP) [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 330,960   882,986    
Commercial real estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 5,734,699   5,501,509    
SFR mortgage [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 231,323   270,511    
Dairy And Livestock And Agribusiness [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 279,584   361,146    
Municipal Lease Finance Receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross 47,305   45,547    
Less: Allowance for credit losses (85) $ (67) (74) $ (149) $ (302)
Consumer and other loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Notes receivable gross $ 70,741   $ 86,006