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Loan and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Nonaccrual commercial real estate loans [Member]
Jun. 30, 2013
Nonaccrual Consumer Loans [Member]
Dec. 31, 2012
Non-covered impaired loans [Member]
Jun. 30, 2013
Construction [Member]
SecurityLoan
Jun. 30, 2013
Nonaccrual Residential Construction and Land Loans [Member]
Jun. 30, 2013
Nonaccrual commercial and industrial loans [Member]
Jun. 30, 2013
Commercial real estate loans [Member]
Jun. 30, 2013
Commercial real estate loans [Member]
SecurityLoan
Jun. 30, 2013
Nonaccrual dairy and livestock loans [Member]
Jun. 30, 2013
Non-covered Impaired Loans Modified in Troubled Debt Restructure [Member]
Jun. 30, 2013
Dairy & livestock and agribusiness [Member]
SecurityLoan
Jun. 30, 2013
Single-family residential loans [Member]
SecurityLoan
Jun. 30, 2013
Commercial and Industrial [Member]
Jun. 30, 2013
Commercial and Industrial [Member]
SecurityLoan
Jun. 30, 2013
Performing financing receivable [Member]
SecurityLoan
Jun. 30, 2013
Nonperforming financing receivable [Member]
Jun. 30, 2013
Nonaccrual single family mortgage loans [Member]
Jun. 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                 1.41%     64.20% 64.20%                      
Fixed rate loans held $ 1,600,000,000   $ 1,600,000,000                                          
Secure borrowings from FHLB and Federal Reserve Bank 1,980,000,000   1,980,000,000   2,320,000,000                                      
Impaired, at carrying value 114,917,000   114,917,000   108,390,000     108,400,000             88,100,000         114,900,000 26,500,000     2,300,000
Outstanding balance           18,600,000 157,000     10,500,000 5,000,000     7,700,000               11,400,000    
Impaired, at carrying value 88,100,000   88,100,000           16,900,000     21,000,000 21,000,000     20,500,000 2,000,000 1,200,000 1,200,000 61,600,000 26,500,000   4,900,000  
Number of performing loans                                       40        
Amount of impaired loan transferred to nonaccrual status     10,500,000                                          
Reserve for unfunded commitments 0 0 0 0                                        
Reserve for credit risk for undisbursed commitments 8,600,000   8,600,000   8,600,000                                      
Number of loans                 2       14     10 7   7          
Allocation of allowance to troubled debt restructuring 1,900,000   1,900,000   1,400,000                                      
Troubled debt restructurings, pre-modification outstanding recorded investment $ 11,147,000 $ 20,197,000 $ 15,606,000 $ 23,551,000               $ 23,000,000           $ 89,000