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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, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 101,903   $ 116,925      
Total loans 8,407,872   7,568,319      
Less: Deferred loan fees, net   (3,742)      
Total loans, net of deferred loan fees 8,407,872   7,564,577      
Less: Allowance for credit losses (93,869) $ (93,983) (68,660) $ (68,672) $ (67,132) $ (63,613)
Net loans and lease finance receivables 8,314,003   7,495,917      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 817,056   935,127      
Total loans 817,056          
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 304,987   305,008      
Total loans 304,987          
SBA - Paycheck Protection Program (PPP) [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 1,101,142        
Total loans 1,101,142          
Less: Allowance for credit losses 0 0 0      
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 5,428,223   5,374,617      
Total loans 5,428,223          
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 274,731   283,468      
Total loans 274,731          
Dairy & livestock and agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 252,802   383,709      
Total loans 252,802          
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 38,040   53,146      
Total loans 38,040   53,146      
Less: Allowance for credit losses (149) $ (302)   $ (662) $ (726) $ (775)
Consumer and other loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 88,988   $ 116,319      
Total loans $ 88,988