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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Components of Loans and Lease Finance Receivables, Including PCI Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction $ 119,931   $ 122,782      
Total Gross loans 7,498,317   7,769,439      
Less: Deferred loan fees, net (3,866)   (4,828)      
Gross loans, net of deferred loan fees 7,494,451   7,764,611      
Less: Allowance for loan losses (68,672) $ (67,132) (63,613) $ (60,007) $ (59,583) $ (59,585)
Total loans and lease finance receivables 7,425,779   7,700,998      
Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 921,678   1,002,728      
SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 319,571   351,301      
Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 5,375,668   5,408,636      
SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 278,644   296,649      
Dairy & livestock and agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 311,229   394,543      
Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 54,468   64,186      
Less: Allowance for loan losses (662) $ (726) (775) (815) (808) (851)
Consumer and other loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 117,128   128,614      
PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Construction     0      
Total Gross loans     17,214      
Less: Deferred loan fees, net     0      
Gross loans, net of deferred loan fees     17,214      
Less: Allowance for loan losses     (204) $ (205) $ (216) $ (367)
Total loans and lease finance receivables     17,010      
PCI Loans [Member] | Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     519      
PCI Loans [Member] | SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     1,258      
PCI Loans [Member] | Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     14,407      
PCI Loans [Member] | SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     145      
PCI Loans [Member] | Dairy & livestock and agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     700      
PCI Loans [Member] | Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     0      
PCI Loans [Member] | Consumer and other loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     185      
Loans, Excluding PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 311,200          
Construction     122,782      
Total Gross loans 7,498,317   7,752,225      
Less: Deferred loan fees, net     (4,828)      
Gross loans, net of deferred loan fees     7,747,397      
Less: Allowance for loan losses     (63,409)      
Total loans and lease finance receivables     7,683,988      
Loans, Excluding PCI Loans [Member] | Commercial And Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 921,678   1,002,209      
Loans, Excluding PCI Loans [Member] | SBA [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 319,571   350,043      
Loans, Excluding PCI Loans [Member] | Commercial real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross     5,394,229      
Loans, Excluding PCI Loans [Member] | SFR mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 278,644   296,504      
Loans, Excluding PCI Loans [Member] | Dairy & livestock and agribusiness [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 311,229   393,843      
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross 54,468   64,186      
Total Gross loans 54,468   64,186      
Loans, Excluding PCI Loans [Member] | Consumer and other loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Notes receivable gross $ 117,128   $ 128,429