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Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Nonaccrual commercial real estate loans [Member]
Sep. 30, 2013
Nonaccrual Consumer Loans [Member]
Dec. 31, 2012
Non-covered impaired loans [Member]
Sep. 30, 2013
Construction [Member]
SecurityLoan
Sep. 30, 2013
Nonaccrual Residential Construction and Land Loans [Member]
Sep. 30, 2013
Nonaccrual commercial and industrial loans [Member]
Sep. 30, 2013
Commercial real estate loans [Member]
Sep. 30, 2013
Commercial real estate loans [Member]
SecurityLoan
Sep. 30, 2013
Nonaccrual dairy and livestock loans [Member]
Sep. 30, 2013
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member]
Sep. 30, 2013
Dairy & Livestock and Agribusiness [Member]
SecurityLoan
Sep. 30, 2013
Single-family residential loans [Member]
SecurityLoan
Sep. 30, 2013
Commercial and Industrial [Member]
SecurityLoan
Sep. 30, 2013
Performing financing receivable [Member]
SecurityLoan
Sep. 30, 2013
Nonaccrual single family mortgage loans [Member]
Sep. 30, 2013
Nonperforming financing receivable [Member]
Sep. 30, 2013
Allowance Impaired loans [Member]
Dec. 31, 2012
Allowance impaired non-covered loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]                                              
Percentage of gross loan portfolio                 1.39%     65.56% 65.56%                    
Fixed rate loans held $ 1,730,000,000   $ 1,730,000,000                                        
Secure borrowings from FHLB and Federal Reserve Bank 1,990,000,000   1,990,000,000   2,320,000,000                                    
Reduction in allowance for loan losses 3,800,000 0 10,000,000 0                                      
Impaired, at carrying value 108,679,000   108,679,000   108,390,000     108,400,000             87,200,000       108,700,000   28,000,000   2,300,000
Outstanding balance           17,800,000 159,000     10,400,000 3,700,000     7,000,000           10,400,000      
Impaired, at carrying value 87,200,000   87,200,000           16,900,000     21,200,000 21,200,000     17,500,000 2,400,000 1,200,000 59,200,000   28,000,000 3,500,000  
Number of performing loans                                     41        
Amount of impaired loan transferred to nonaccrual status     10,400,000                                        
Reserve for unfunded commitments 500,000   500,000 0                                      
Reserve for credit risk for undisbursed commitments 9,100,000   9,100,000   9,100,000                                    
Number of loans                 2       15     9 8 7          
Allocation of allowance to troubled debt restructuring 2,900,000   2,900,000   1,400,000                                    
Troubled debt restructurings, pre-modification outstanding recorded investment $ 3,676,000 $ 9,331,000 $ 19,281,000 $ 33,480,000               $ 2,200,000