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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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Construction $ 96,356 $ 85,145  
Total loans, at amortized cost 8,293,057 8,348,808  
Less: Allowance for credit losses (71,805) (93,692) $ (82,641)
Net loans and lease finance receivables 8,221,252 8,255,116  
Commercial And Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 753,708 812,062  
SBA [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 307,727 303,896  
SBA - Paycheck Protection Program (PPP) [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 897,724  
Less: Allowance for credit losses 0 0  
Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 5,596,781 5,501,509  
SFR mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 255,400 270,511  
Dairy & livestock and agribusiness [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 261,088 361,146  
Municipal Lease Finance Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross 42,349 45,547  
Less: Allowance for credit losses (35) (74) $ (277)
Consumer and other loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable gross $ 81,924 $ 86,006