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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2016
USD ($)
SecurityLoan
Mar. 31, 2015
USD ($)
SecurityLoan
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total fixed rate loans held $ 2,030,000,000    
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank 3,020,000,000   $ 2,910,000,000
Impaired, at carrying value 55,465,000 $ 68,377,000 63,706,000
Loans classified as troubled debt restructured 49,700,000    
Provision for unfunded loan commitments 0 $ 500,000  
Reserve for credit risk for undisbursed commitments 7,200,000   7,200,000
Allocation of allowance to troubled debt restructuring $ 642,000   607,000
Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total gross loan portfolio (excluding PCI loans) 68.77%    
Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total gross loan portfolio (excluding PCI loans) 2.19%    
Nonaccrual Small Business Administration Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance $ 2,400,000    
Impaired Loans Modified in Troubled Debt Restructure [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 49,700,000    
Nonaccrual Single Family Mortgage Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 2,500,000    
Nonaccrual Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 12,100,000    
Nonaccrual Consumer Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 456,000    
Loans, Excluding PCI Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial real estate loans 2,819,119,000   2,643,184,000
Dairy & livestock and agribusiness 227,710,000   305,509,000
Impaired, at carrying value     63,700,000
Outstanding balance 18,144,000   21,019,000
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 622,000    
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Dairy & livestock and agribusiness 210,200,000   287,000,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 622,000   704,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 2,435,000   2,567,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 456,000   519,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Dairy & livestock and agribusiness $ 17,500,000   $ 18,500,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total gross loan portfolio (excluding PCI loans) 6.35%   6.54%
Commercial real estate loans $ 178,900,000   $ 173,000,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial real estate loans 135,100,000   128,400,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial real estate loans 43,800,000   44,600,000
Nonperforming Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 12,400,000    
Loans classified as troubled debt restructured 12,400,000    
Performing Financing Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 55,500,000    
Loans classified as troubled debt restructured $ 37,300,000    
Number of performing loans | SecurityLoan 35    
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 23,500,000    
Number of loans | SecurityLoan 14    
Performing Financing Receivable [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 7,700,000    
Number of loans | SecurityLoan 1    
Performing Financing Receivable [Member] | Dairy & Livestock Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 714,000    
Number of loans | SecurityLoan 1    
Performing Financing Receivable [Member] | Single-family Residential Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 3,300,000    
Number of loans | SecurityLoan 11    
Performing Financing Receivable [Member] | Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 855,000    
Number of loans | SecurityLoan 5    
Performing Financing Receivable [Member] | Small Business Administration [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 869,000    
Number of loans | SecurityLoan 2    
Performing Financing Receivable [Member] | Consumer and Other Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured $ 412,000    
Number of loans | SecurityLoan 1    
Number of loans removed from TDR classification | SecurityLoan 0 0  
Allowance Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value     $ 669,000
Loans classified as troubled debt restructured $ 694,000