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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 92,218 $ 91,922 $ 92,441 $ 93,964
Charge-offs (769) (1,602) (1,315) (3,958)
Recoveries 208 1,572 531 1,886
Provision / reallocation of ALLL (6,200)   (6,200)  
Ending balance 85,457 91,892 85,457 91,892
Individually evaluated for impairment 4,856 1,254 4,856 1,254
Collectively evaluated for impairment 80,601 90,638 80,601 90,638
Ending balance 3,351,814 3,390,762 3,351,814 3,390,762
Individually evaluated for impairment 114,917 107,108 114,917 107,108
Collectively evaluated for impairment 3,063,054 3,073,507 3,063,054 3,073,507
Acquired loans with deteriorated credit quality, net of discount 173,843 210,147 173,843 210,147
Covered Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Charge-offs   (50)   (81)
Provision / reallocation of ALLL   50   81
Ending balance 173,843 210,147 173,843 210,147
Acquired loans with deteriorated credit quality, net of discount 173,843 210,147 173,843 210,147
Commercial and Industrial [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 12,313 11,907 11,652 10,654
Charge-offs (747) (123) (1,104) (683)
Recoveries 109 526 208 588
Provision / reallocation of ALLL 911 22 1,830 1,773
Ending balance 12,586 12,332 12,586 12,332
Individually evaluated for impairment 1,905 486 1,905 486
Collectively evaluated for impairment 10,681 11,846 10,681 11,846
Ending balance 525,144 523,816 525,144 523,816
Individually evaluated for impairment 6,171 7,926 6,171 7,926
Collectively evaluated for impairment 518,973 515,890 518,973 515,890
Commercial Real Estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 46,725 48,462 47,457 47,841
Charge-offs   (952)   (1,482)
Recoveries 29 150 66 347
Provision / reallocation of ALLL (2,362) (2,341) (3,131) (1,387)
Ending balance 44,392 45,319 44,392 45,319
Individually evaluated for impairment 1 362 1 362
Collectively evaluated for impairment 44,391 44,957 44,391 44,957
Ending balance 2,008,746 1,965,011 2,008,746 1,965,011
Individually evaluated for impairment 39,623 35,754 39,623 35,754
Collectively evaluated for impairment 1,969,123 1,929,257 1,969,123 1,929,257
Construction [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 2,124 4,323 2,291 4,947
Recoveries (58) 1,025 68 1,052
Provision / reallocation of ALLL (894) (2,319) (1,187) (2,970)
Ending balance 1,172 3,029 1,172 3,029
Collectively evaluated for impairment 1,172 3,029 1,172 3,029
Ending balance 46,365 68,312 46,365 68,312
Individually evaluated for impairment 27,365 37,989 27,365 37,989
Collectively evaluated for impairment 19,000 30,323 19,000 30,323
SFR Mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 3,606 3,473 3,448 4,032
Charge-offs   (474) (142) (474)
Recoveries 99 (136) 133 (112)
Provision / reallocation of ALLL 10 176 276 (407)
Ending balance 3,715 3,039 3,715 3,039
Individually evaluated for impairment 351 306 351 306
Collectively evaluated for impairment 3,364 2,733 3,364 2,733
Ending balance 180,123 159,633 180,123 159,633
Individually evaluated for impairment 13,440 14,147 13,440 14,147
Collectively evaluated for impairment 166,683 145,486 166,683 145,486
Dairy & Livestock and Agribusiness [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 16,571 16,080 18,696 17,278
Charge-offs       (1,150)
Recoveries 14 2 28 2
Provision / reallocation of ALLL (2,360) 894 (4,499) 846
Ending balance 14,225 16,976 14,225 16,976
Individually evaluated for impairment 2,593   2,593  
Collectively evaluated for impairment 11,632 16,976 11,632 16,976
Ending balance 259,127 290,430 259,127 290,430
Individually evaluated for impairment 28,161 10,900 28,161 10,900
Collectively evaluated for impairment 230,966 279,530 230,966 279,530
Municipal Lease Finance Receivables [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 2,632 2,020 1,588 2,403
Provision / reallocation of ALLL (263) (364) 781 (747)
Ending balance 2,369 1,656 2,369 1,656
Collectively evaluated for impairment 2,369 1,656 2,369 1,656
Ending balance 105,246 109,816 105,246 109,816
Collectively evaluated for impairment 105,246 109,816 105,246 109,816
Consumer and Other Loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 1,133 1,489 1,170 1,590
Charge-offs (22) (3) (69) (88)
Recoveries 15 5 28 9
Provision / reallocation of ALLL (74) (90) (77) (110)
Ending balance 1,052 1,401 1,052 1,401
Individually evaluated for impairment 6 100 6 100
Collectively evaluated for impairment 1,046 1,301 1,046 1,301
Ending balance 53,220 63,597 53,220 63,597
Individually evaluated for impairment 157 392 157 392
Collectively evaluated for impairment 53,063 63,205 53,063 63,205
Unallocated [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 7,114 4,168 6,139 5,219
Provision / reallocation of ALLL (1,168) 3,972 (193) 2,921
Ending balance 5,946 8,140 5,946 8,140
Collectively evaluated for impairment $ 5,946 $ 8,140 $ 5,946 $ 8,140