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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Non-Covered Held-for-Investment Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance $ 75,235  
Provision for loan losses (7,500)   
Ending Balance 68,725  
Non-Covered Loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 75,235 92,441
Charge-offs (467) (546)
Recoveries 1,457 323
Provision for loan losses (7,500)  
Ending Balance 68,725 92,218
Non-Covered Loans [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 10,834 11,652
Charge-offs (454) (357)
Recoveries 455 99
Provision for loan losses (1,999) 919
Ending Balance 8,836 12,313
Non-Covered Loans [Member] | Commercial Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 39,402 47,457
Charge-offs      
Recoveries 68 37
Provision for loan losses (70) (769)
Ending Balance 39,400 46,725
Non-Covered Loans [Member] | Construction [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 1,305 2,291
Charge-offs      
Recoveries 778 126
Provision for loan losses (1,625) (293)
Ending Balance 458 2,124
Non-Covered Loans [Member] | SFR Mortgage [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 2,718 3,448
Charge-offs    (142)
Recoveries    34
Provision for loan losses (436) 266
Ending Balance 2,282 3,606
Non-Covered Loans [Member] | Dairy & Livestock and Agribusiness [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 11,728 18,696
Charge-offs      
Recoveries 144 14
Provision for loan losses (2,605) (2,139)
Ending Balance 9,267 16,571
Non-Covered Loans [Member] | Municipal Lease Finance Receivables [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 2,335 1,588
Charge-offs      
Recoveries      
Provision for loan losses (816) 1,044
Ending Balance 1,519 2,632
Non-Covered Loans [Member] | Consumer and Other Loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 960 1,170
Charge-offs (13) (47)
Recoveries 12 13
Provision for loan losses (9) (3)
Ending Balance 950 1,133
Non-Covered Loans [Member] | Unallocated [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 5,953 6,139
Provision for loan losses 60 975
Ending Balance $ 6,013 $ 7,114