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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
SecurityLoan
Mar. 31, 2013
Dec. 31, 2013
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-covered fixed rate loans held $ 1,640,000,000    
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank 2,370,000,000   2,310,000,000
Impaired, at carrying value 106,596,000 112,721,000 106,909,000
Loans classified as troubled debt restructured 90,400,000    
Impaired construction speculative loans 9,900,000   10,000,000
Number of nonaccruing loan 1   1
Provision for unfunded loan commitments 0 0  
Reserve for credit risk for undisbursed commitments 9,100,000   9,100,000
Number of loans 0    
Allocation of allowance to troubled debt restructuring 3,100,000   2,700,000
Nonaccrual Commercial Real Estate Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 11,800,000    
Nonaccrual Consumer Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 397,000    
Impaired loans-non-covered [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value     106,900,000
Nonaccrual Residential Construction and Land Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 9,900,000    
Nonaccrual Commercial and Industrial Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 4,800,000    
Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 106,600,000    
Loans classified as troubled debt restructured 66,400,000    
Number of performing loans 44    
Number of loans removed from TDR classification 0 0  
Nonaccrual Single Family Mortgage Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 7,900,000    
Nonperforming Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value 24,000,000    
Loans classified as troubled debt restructured 24,000,000    
Allowance Impaired loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 4,000,000    
Allowance Impaired Non-covered Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value     3,200,000
Commercial Real Estate Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total non-covered loan portfolio 67.17%    
Commercial Real Estate Loans [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 22,100,000    
Number of loans 13    
Construction [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of total non-covered loan portfolio 1.31%    
Construction [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 16,800,000    
Number of loans 2    
Dairy & Livestock and Agribusiness [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 22,600,000    
Number of loans 11    
Single-family residential loans [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 3,800,000    
Number of loans 11    
Commercial and Industrial [Member] | Performing Financing Receivable [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans classified as troubled debt restructured 1,100,000    
Number of loans 7    
Nonaccrual Dairy and Livestock Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding balance 5,400,000    
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired, at carrying value $ 90,400,000