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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fixed rate loans held $ 1,640,000,000    
Secure borrowings from FHLB and Federal Reserve Bank 2,310,000,000 2,320,000,000  
Impaired, at carrying value 106,909,000 108,390,000 101,226,000
Impaired, at carrying value 92,100,000    
Impaired construction speculative loans 10,000,000    
Reserve for unfunded commitments 500,000 (1,000,000) (918,000)
Reserve for credit risk for undisbursed commitments 9,100,000 8,600,000  
Allocation of allowance to troubled debt restructuring 2,700,000 1,700,000  
Troubled debt restructurings, pre-modification outstanding recorded investment 0   56,592,000
Nonaccrual Commercial Real Estate Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 12,400,000    
Nonaccrual Consumer Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 401,000    
Non-covered Impaired Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value   108,400,000  
Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 106,900,000    
Impaired, at carrying value 67,000,000    
Number of performing loans 46    
Nonaccrual Single Family Mortgage Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 7,600,000    
Nonperforming Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 25,100,000    
Impaired, at carrying value 25,100,000    
Allowance Impaired loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 3,200,000    
Allowance Impaired Non-covered Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value   2,300,000  
Nonaccrual Residential Construction and Land Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 10,000,000    
Nonaccrual Commercial and Industrial Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 3,900,000    
Commercial Real Estate Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total loan portfolio 65.02%    
Number of loans   1 2
Troubled debt restructurings, pre-modification outstanding recorded investment   2,400,000 3,400,000
Commercial Real Estate Loans [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 21,000,000    
Number of loans 15    
Construction [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total loan portfolio 1.39%    
Number of loans   1  
Troubled debt restructurings, pre-modification outstanding recorded investment   10,700,000  
Construction [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 16,900,000    
Number of loans 2    
Nonaccrual Dairy and Livestock Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 5,700,000    
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 92,100,000    
Dairy & Livestock and Agribusiness [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans     2
Troubled debt restructurings, pre-modification outstanding recorded investment     886,000
Dairy & Livestock and Agribusiness [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 24,100,000    
Number of loans 11    
Single-family Residential Loans [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 3,800,000    
Number of loans 11    
Commercial and Industrial [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value $ 1,200,000    
Number of loans 7