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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, 2016
USD ($)
SecurityLoan
Sep. 30, 2015
USD ($)
SecurityLoan
Sep. 30, 2016
USD ($)
SecurityLoan
Sep. 30, 2015
USD ($)
SecurityLoan
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total fixed rate loans held $ 2,020,000,000   $ 2,020,000,000    
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank 3,150,000,000   3,150,000,000   $ 2,910,000,000
Impaired, at carrying value 35,684,000 $ 68,861,000 35,684,000 $ 68,861,000 63,706,000
Loans classified as troubled debt restructured 30,000,000   30,000,000    
Provision for unfunded loan commitments 0 $ 0 0 $ 500,000  
Reserve for credit risk for undisbursed commitments 7,200,000   7,200,000   7,200,000
Allocation of allowance to troubled debt restructuring $ 472,000   $ 472,000   607,000
Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of total gross loan portfolio (excluding PCI loans) 76.69%   76.69%    
Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of total gross loan portfolio (excluding PCI loans) 68.84%   68.84%    
Nonaccrual Small Business Administration Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance $ 3,000,000   $ 3,000,000    
Impaired Loans Modified in Troubled Debt Restructure [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 30,000,000   30,000,000    
Nonaccrual Single Family Mortgage Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 2,200,000   2,200,000    
Nonaccrual Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 2,400,000   2,400,000    
Nonaccrual Consumer Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 470,000   470,000    
Loans, Excluding PCI Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial real estate loans 2,911,765,000   2,911,765,000   2,643,184,000
Dairy & livestock and agribusiness 239,242,000   239,242,000   305,509,000
Impaired, at carrying value         63,700,000
Outstanding balance 8,666,000   8,666,000   21,019,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Dairy & livestock and agribusiness 220,800,000   220,800,000   287,000,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 543,000   543,000   704,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 3,013,000   3,013,000   2,567,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 470,000   470,000   519,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Dairy & livestock and agribusiness 18,400,000   18,400,000   $ 18,500,000
Loans, Excluding PCI Loans [Member] | Nonaccrual Commercial and Industrial Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance $ 543,000   $ 543,000    
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) 6.11%   6.11%   6.54%
Commercial real estate loans $ 178,000,000   $ 178,000,000   $ 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 128,800,000   128,800,000   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 49,200,000   49,200,000   44,600,000
Nonperforming Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 3,000,000   3,000,000    
Loans classified as troubled debt restructured 3,000,000   3,000,000    
Performing Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 35,700,000   35,700,000    
Loans classified as troubled debt restructured 27,000,000   $ 27,000,000    
Number of performing loans | SecurityLoan     29    
Performing Financing Receivable [Member] | Commercial Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 13,400,000   $ 13,400,000    
Number of loans | SecurityLoan     8    
Performing Financing Receivable [Member] | Construction [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 7,700,000   $ 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 659,000   $ 659,000    
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   $ 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 806,000   $ 806,000    
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 854,000   $ 854,000    
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 $ 380,000   $ 380,000    
Number of loans | SecurityLoan     1    
Number of loans removed from TDR classification | SecurityLoan 0 0 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 $ 548,000   $ 548,000