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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance     $ 75,235  
Provision for loan losses (1,000) (3,750) (16,100) (9,950)
Ending Balance 59,582   59,582  
Non-Covered Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 60,974 85,457 75,235 92,441
Charge-offs (1,070) (1,384) (1,995) (2,699)
Recoveries 678 390 2,442 921
Provision for loan losses (1,000) (3,750) (16,100) (9,950)
Ending Balance 59,582 80,713 59,582 80,713
Non-Covered Loans [Member] | Commercial and industrial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 8,402 12,586 10,834 11,652
Charge-offs (2) (1,235) (516) (2,339)
Recoveries 187 315 748 523
Provision for loan losses 97 (1,022) (2,382) 808
Ending Balance 8,684 10,644 8,684 10,644
Non-Covered Loans [Member] | Commercial real estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 35,918 44,392 39,402 47,457
Charge-offs       (352)   
Recoveries 2 34 140 100
Provision for loan losses (286) (1,007) (3,556) (4,138)
Ending Balance 35,634 43,419 35,634 43,419
Non-Covered Loans [Member] | Construction [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 605 1,172 1,305 2,291
Charge-offs            
Recoveries 37 15 834 83
Provision for loan losses 148 412 (1,349) (775)
Ending Balance 790 1,599 790 1,599
Non-Covered Loans [Member] | SFR mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 2,214 3,715 2,718 3,448
Charge-offs    (110)    (252)
Recoveries 188    188 133
Provision for loan losses (97) (144) (601) 132
Ending Balance 2,305 3,461 2,305 3,461
Non-Covered Loans [Member] | Dairy & livestock and agribusiness [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 5,428 14,225 11,728 18,696
Charge-offs (1,061)    (1,061)   
Recoveries 151 14 393 42
Provision for loan losses (241) (2,152) (6,783) (6,651)
Ending Balance 4,277 12,087 4,277 12,087
Non-Covered Loans [Member] | Municipal lease finance receivables [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 1,464 2,369 2,335 1,588
Charge-offs            
Recoveries            
Provision for loan losses 4 69 (867) 850
Ending Balance 1,468 2,438 1,468 2,438
Non-Covered Loans [Member] | Consumer and other loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 930 1,052 960 1,170
Charge-offs (7) (39) (26) (108)
Recoveries 113 12 139 40
Provision for loan losses (169) 25 (206) (52)
Ending Balance 867 1,050 867 1,050
Non-Covered Loans [Member] | Covered Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance          
Charge-offs      (40)  
Recoveries          
Provision for loan losses      40  
Ending Balance          
Non-Covered Loans [Member] | Unallocated [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 6,013 5,946 5,953 6,139
Charge-offs            
Recoveries            
Provision for loan losses (456) 69 (396) (124)
Ending Balance $ 5,557 $ 6,015 $ 5,557 $ 6,015