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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
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial $ 917,953   $ 1,002,728      
SBA 327,606   351,301      
Commercial real estate 5,417,351   5,408,636      
Construction 116,457   122,782      
SFR mortgage 278,285   296,649      
Dairy & livestock and agribusiness 301,752   394,543      
Municipal lease finance receivables 59,985   64,186      
Consumer and other loans 120,779   128,614      
Total Gross loans 7,540,168   7,769,439      
Less: Deferred loan fees, net (4,478)   (4,828)      
Gross loans, net of deferred loan fees 7,535,690   7,764,611      
Less: Allowance for loan losses (67,132) $ (65,201) (63,613) $ (59,583) $ (59,935) $ (59,585)
Total loans and lease finance receivables 7,468,558   7,700,998      
PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial     519      
SBA     1,258      
Commercial real estate     14,407      
Construction     0      
SFR mortgage     145      
Dairy & livestock and agribusiness     700      
Municipal lease finance receivables     0      
Consumer and other loans     185      
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) $ (216) $ (312) $ (367)
Total loans and lease finance receivables     17,010      
Loans, Excluding PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial 917,953   1,002,209      
SBA 327,606   350,043      
Commercial real estate     5,394,229      
Construction     122,782      
SFR mortgage 278,285   296,504      
Dairy & livestock and agribusiness 301,752   393,843      
Municipal lease finance receivables 59,985   64,186      
Consumer and other loans 120,779   128,429      
Total Gross loans $ 7,540,168   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