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Loan and Lease Finance Receivables and Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investment in Held-For-Investment Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 85,457 $ 91,892 $ 92,441 $ 93,964
Charge-offs (1,384) (886) (2,699) (4,844)
Recoveries 390 1,061 921 2,947
Provision / reallocation of ALLL (3,750)    (9,950)   
Ending balance 80,713 92,067 80,713 92,067
Individually evaluated for impairment 3,485 2,010 3,485 2,010
Collectively evaluated for impairment 77,228 90,057 77,228 90,057
Ending balance 3,453,805 3,441,049 3,453,805 3,441,049
Individually evaluated for impairment 108,679 117,601 108,679 117,601
Collectively evaluated for impairment 3,181,792 3,116,141 3,181,792 3,116,141
Acquired loans with deteriorated credit quality, net of discount 163,334 207,307 163,334 207,307
Covered Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance            
Charge-offs          (81)
Recoveries    728    728
Provision / reallocation of ALLL    (728)    (647)
Ending balance            
Individually evaluated for impairment            
Collectively evaluated for impairment            
Ending balance 163,334 207,307 163,334 207,307
Individually evaluated for impairment            
Collectively evaluated for impairment            
Acquired loans with deteriorated credit quality, net of discount 163,334 207,307 163,334 207,307
Commercial and Industrial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 12,586 12,332 11,652 10,654
Charge-offs (1,235) (294) (2,339) (977)
Recoveries 315 106 523 694
Provision / reallocation of ALLL (1,022) (13) 808 1,760
Ending balance 10,644 12,131 10,644 12,131
Individually evaluated for impairment 387 481 387 481
Collectively evaluated for impairment 10,257 11,650 10,257 11,650
Ending balance 510,566 525,801 510,566 525,801
Individually evaluated for impairment 4,983 4,457 4,983 4,457
Collectively evaluated for impairment 505,583 521,344 505,583 521,344
Acquired loans with deteriorated credit quality, net of discount          
Commercial Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 44,392 45,319 47,457 47,841
Charge-offs   (358)   (1,840)
Recoveries 34 134 100 481
Provision / reallocation of ALLL (1,007) (280) (4,138) (1,667)
Ending balance 43,419 44,815 43,419 44,815
Individually evaluated for impairment 1 25 1 25
Collectively evaluated for impairment 43,418 44,790 43,418 44,790
Ending balance 2,126,415 2,012,119 2,126,415 2,012,119
Individually evaluated for impairment 38,999 41,955 38,999 41,955
Collectively evaluated for impairment 2,087,416 1,970,164 2,087,416 1,970,164
Acquired loans with deteriorated credit quality, net of discount          
Construction [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 1,172 3,029 2,291 4,947
Charge-offs         
Recoveries 15 77 83 1,129
Provision / reallocation of ALLL 412 265 (775) (2,705)
Ending balance 1,599 3,371 1,599 3,371
Individually evaluated for impairment 144    144   
Collectively evaluated for impairment 1,455 3,371 1,455 3,371
Ending balance 47,648 70,740 47,648 70,740
Individually evaluated for impairment 27,239 37,794 27,239 37,794
Collectively evaluated for impairment 20,409 32,946 20,409 32,946
Acquired loans with deteriorated credit quality, net of discount            
SFR Mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 3,715 3,039 3,448 4,032
Charge-offs (110) (168) (252) (642)
Recoveries   4 133 (108)
Provision / reallocation of ALLL (144) 366 132 (41)
Ending balance 3,461 3,241 3,461 3,241
Individually evaluated for impairment 290 348 290 348
Collectively evaluated for impairment 3,171 2,893 3,171 2,893
Ending balance 192,130 158,074 192,130 158,074
Individually evaluated for impairment 12,805 13,852 12,805 13,852
Collectively evaluated for impairment 179,325 144,222 179,325 144,222
Acquired loans with deteriorated credit quality, net of discount            
Dairy & Livestock and Agribusiness [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 14,225 16,976 18,696 17,278
Charge-offs        (1,150)
Recoveries 14 9 42 11
Provision / reallocation of ALLL (2,152) 2,861 (6,651) 3,707
Ending balance 12,087 19,846 12,087 19,846
Individually evaluated for impairment 2,658 1,043 2,658 1,043
Collectively evaluated for impairment 9,429 18,803 9,429 18,803
Ending balance 261,638 297,932 261,638 297,932
Individually evaluated for impairment 24,494 18,708 24,494 18,708
Collectively evaluated for impairment 237,144 279,224 237,144 279,224
Acquired loans with deteriorated credit quality, net of discount            
Municipal lease finance receivables [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 2,369 1,656 1,588 2,403
Charge-offs         
Recoveries         
Provision / reallocation of ALLL 69 (110) 850 (857)
Ending balance 2,438 1,546 2,438 1,546
Individually evaluated for impairment          
Collectively evaluated for impairment 2,438 1,546 2,438 1,546
Ending balance 99,188 109,005 99,188 109,005
Individually evaluated for impairment   471   471
Collectively evaluated for impairment 99,188 108,534 99,188 108,534
Acquired loans with deteriorated credit quality, net of discount            
Consumer and Other Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 1,052 1,401 1,170 1,590
Charge-offs (39) (66) (108) (154)
Recoveries 12 3 40 12
Provision / reallocation of ALLL 25 (52) (52) (162)
Ending balance 1,050 1,286 1,050 1,286
Individually evaluated for impairment 5 113 5 113
Collectively evaluated for impairment 1,045 1,173 1,045 1,173
Ending balance 52,886 60,071 52,886 60,071
Individually evaluated for impairment 159 364 159 364
Collectively evaluated for impairment 52,727 59,707 52,727 59,707
Acquired loans with deteriorated credit quality, net of discount            
Unallocated [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 5,946 8,140 6,139 5,219
Charge-offs          
Recoveries          
Provision / reallocation of ALLL 69 (2,309) (124) 612
Ending balance 6,015 5,831 6,015 5,831
Individually evaluated for impairment            
Collectively evaluated for impairment 6,015 5,831 6,015 5,831
Ending balance            
Individually evaluated for impairment            
Collectively evaluated for impairment            
Acquired loans with deteriorated credit quality, net of discount