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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
USD ($)
SecurityLoan
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2014
USD ($)
SecurityLoan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total fixed rate loans held $ 1,840,000,000   $ 1,840,000,000    
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank 2,890,000,000   2,890,000,000   $ 2,780,000,000
Impaired, at carrying value 68,861,000 $ 92,658,000 68,861,000 $ 92,658,000 85,792,000
Loans classified as troubled debt restructured 60,400,000   60,400,000    
Provision for unfunded loan commitments 0 $ 1,250,000 500,000 $ 1,250,000  
Reserve for credit risk for undisbursed commitments $ 7,200,000   $ 7,200,000   7,700,000
Number of loans | SecurityLoan 0   0    
Allocation of allowance to troubled debt restructuring $ 419,000   $ 419,000   726,000
Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of total gross loan portfolio (excluding PCI loans) 68.76%   68.76%    
Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of total gross loan portfolio (excluding PCI loans) 1.54%   1.54%    
Nonaccrual Commercial and Industrial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance $ 1,100,000   $ 1,100,000    
Nonaccrual Small Business Administration Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 2,600,000   2,600,000    
Impaired Loans Modified in Troubled Debt Restructure [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 60,400,000   60,400,000    
Loans, Excluding PCI Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial real estate loans 2,569,128,000   2,569,128,000   2,487,803,000
Dairy & livestock and agribusiness 212,670,000   212,670,000   279,173,000
Impaired, at carrying value         85,800,000
Outstanding balance 23,648,000   23,648,000   32,186,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 0   0   103,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Dairy & livestock and agribusiness 197,900,000   197,900,000   268,100,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Dairy & livestock and agribusiness 14,800,000   14,800,000   11,100,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 1,051,000   1,051,000   2,308,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 489,000   489,000   736,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance $ 2,634,000   $ 2,634,000   $ 2,481,000
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) 6.66%   6.66%   6.66%
Commercial real estate loans $ 171,000,000   $ 171,000,000   $ 165,600,000
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 132,800,000   132,800,000   144,100,000
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 38,200,000   38,200,000   21,500,000
Nonaccrual Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 16,700,000   16,700,000    
Nonaccrual Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 489,000   489,000    
Nonperforming Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 15,200,000   15,200,000    
Loans classified as troubled debt restructured 15,200,000   15,200,000    
Performing Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 68,900,000   68,900,000    
Loans classified as troubled debt restructured 45,200,000   $ 45,200,000    
Number of performing loans | SecurityLoan     32    
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 27,000,000   $ 27,000,000    
Number of loans | SecurityLoan     11    
Performing Financing Receivable [Member] | Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 7,600,000   $ 7,600,000    
Number of loans | SecurityLoan     1    
Performing Financing Receivable [Member] | Dairy & Livestock and Agribusiness [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 5,300,000   $ 5,300,000    
Number of loans | SecurityLoan     3    
Performing Financing Receivable [Member] | Single-family Residential Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 3,600,000   $ 3,600,000    
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 636,000   $ 636,000    
Number of loans | SecurityLoan     4    
Performing Financing Receivable [Member] | Consumer and Other Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured $ 417,000   $ 417,000    
Number of loans | SecurityLoan     1    
Number of loans removed from TDR classification | SecurityLoan 0 0 0 0  
Performing Financing Receivable [Member] | Small Business Administration [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured $ 685,000   $ 685,000    
Number of loans | SecurityLoan     1    
Nonaccrual Single Family Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 2,800,000   $ 2,800,000    
Allowance Impaired Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value         $ 1,500,000
Loans classified as troubled debt restructured $ 662,000   $ 662,000