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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
SecurityLoan
Sep. 30, 2013
Sep. 30, 2014
SecurityLoan
Sep. 30, 2013
Dec. 31, 2013
SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Non-covered fixed rate loans held $ 1,750,000,000   $ 1,750,000,000    
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank 2,610,000,000   2,610,000,000   2,310,000,000
Impaired, at carrying value 92,658,000 108,679,000 92,658,000 108,679,000 106,909,000
Loans classified as troubled debt restructured 78,200,000   78,200,000    
Impaired construction speculative loans     9,700,000   10,000,000
Number of nonaccruing loan 1   1   1
Provision for unfunded loan commitments 1,300,000 500,000 1,300,000 500,000  
Reserve for credit risk for undisbursed commitments 7,800,000   7,800,000   9,100,000
Number of loans 0   0    
Allocation of allowance to troubled debt restructuring 389,000   389,000   2,700,000
Nonaccrual commercial real estate loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 14,800,000   14,800,000    
Nonaccrual consumer loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 461,000   461,000    
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 9,700,000   9,700,000    
Nonaccrual commercial and industrial loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 6,700,000   6,700,000    
Performing financing receivable [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 92,700,000   92,700,000    
Loans classified as troubled debt restructured 55,600,000   55,600,000    
Number of performing loans     39    
Number of loans removed from TDR classification 0 0 0 0  
Nonperforming financing receivable [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value 22,600,000   22,600,000    
Loans classified as troubled debt restructured 22,600,000   22,600,000    
Nonaccrual single family mortgage loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 4,000,000   4,000,000    
Allowance impaired loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 754,000,000,000   754,000,000,000    
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 68.83%   68.83%    
Commercial real estate loans [Member] | Performing financing receivable [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 16,600,000   16,600,000    
Number of loans     10    
Construction [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage of total non-covered loan portfolio 1.88%   1.88%    
Construction [Member] | Performing financing receivable [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans classified as troubled debt restructured 16,700,000   16,700,000    
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 17,500,000   17,500,000    
Number of loans     10    
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   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 1,000,000   1,000,000    
Number of loans     6    
Nonaccrual dairy and livestock loans [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding balance 1,500,000   1,500,000    
Non-covered impaired loans modified in troubled debt restructure [Member]
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired, at carrying value $ 78,200,000   $ 78,200,000