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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, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Construction $ 73,478 $ 62,264    
Total loans 8,591,684 7,887,713    
Less: Allowance for credit losses (76,119) (65,019) $ (71,805) $ (93,692)
Net loans and lease finance receivables 8,515,565 7,822,694    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 924,780 813,063    
Total loans 924,780 813,063    
SBA [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 311,238 288,600    
Total loans 311,238 288,600    
SBA - Paycheck Protection Program (PPP) [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 121,189 186,585    
Total loans 121,189 186,585    
Commercial real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 6,470,841 5,789,730    
SFR mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 255,136 240,654    
Total loans 255,136 240,654    
Dairy And Livestock And Agribusiness [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 292,784 386,219    
Total loans 292,784 386,219    
Municipal Lease Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 65,543 45,933    
Total loans 65,543 45,933    
Less: Allowance for credit losses (152) (100) $ (35) $ (74)
Consumer and other loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 76,695 74,665    
Total loans $ 76,695 $ 74,665