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Loan and Lease Finance Receivables and Allowance for Credit Losses - Summary of Allowance for Credit Losses and Recorded Investment in Held-For-Investment Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance $ 93,964 $ 105,259
Allowance for loan losses, Charge-offs (5,288) (20,521)
Allowance for loan losses, Recoveries 3,765 2,158
Allowance for loan losses, Provision/reallocation of ALLL   7,068
Allowance for loan losses, Ending balance 92,441 93,964
Allowance for loan losses, Individually evaluated for impairment 2,332 2,968
Allowance for loan losses, Collectively evaluated for impairment 90,109 90,996
Ending balance, December 31, 2012 3,454,453 3,481,991
Loans and financing receivables, Individually evaluated for impairment 108,390 101,226
Loans and financing receivables, Collectively evaluated for impairment 3,150,848 3,123,896
Loans and financing receivables, Acquired loans with deteriorated credit quality, net of discount 195,215 256,869
Covered Loans [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Charge-offs (81) (893)
Allowance for loan losses, Recoveries 738  
Allowance for loan losses, Provision/reallocation of ALLL (657) 893
Ending balance, December 31, 2012 195,215 256,869
Loans and financing receivables, Acquired loans with deteriorated credit quality, net of discount 195,215 256,869
Commercial and Industrial [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 10,654 11,472
Allowance for loan losses, Charge-offs (1,259) (1,980)
Allowance for loan losses, Recoveries 1,280 302
Allowance for loan losses, Provision/reallocation of ALLL 977 860
Allowance for loan losses, Ending balance 11,652 10,654
Allowance for loan losses, Individually evaluated for impairment 289 165
Allowance for loan losses, Collectively evaluated for impairment 11,363 10,489
Ending balance, December 31, 2012 547,422 494,299
Loans and financing receivables, Individually evaluated for impairment 3,689 4,954
Loans and financing receivables, Collectively evaluated for impairment 543,733 489,345
Construction [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 4,947 10,188
Allowance for loan losses, Charge-offs   (7,976)
Allowance for loan losses, Recoveries 1,139 757
Allowance for loan losses, Provision/reallocation of ALLL (3,795) 1,978
Allowance for loan losses, Ending balance 2,291 4,947
Allowance for loan losses, Collectively evaluated for impairment 2,291 4,947
Ending balance, December 31, 2012 59,721 76,146
Loans and financing receivables, Individually evaluated for impairment 30,533 33,402
Loans and financing receivables, Collectively evaluated for impairment 29,188 42,744
Real Estate [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 51,873 43,529
Allowance for loan losses, Charge-offs (2,515) (5,870)
Allowance for loan losses, Recoveries 406 748
Allowance for loan losses, Provision/reallocation of ALLL 1,141 13,466
Allowance for loan losses, Ending balance 50,905 51,873
Allowance for loan losses, Individually evaluated for impairment 436 1,339
Allowance for loan losses, Collectively evaluated for impairment 50,469 50,534
Ending balance, December 31, 2012 2,149,395 2,124,734
Loans and financing receivables, Individually evaluated for impairment 56,981 52,141
Loans and financing receivables, Collectively evaluated for impairment 2,092,414 2,072,593
Municipal lease finance receivables [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 2,403 2,172
Allowance for loan losses, Provision/reallocation of ALLL (815) 231
Allowance for loan losses, Ending balance 1,588 2,403
Allowance for loan losses, Collectively evaluated for impairment 1,588 2,403
Ending balance, December 31, 2012 105,767 113,460
Loans and financing receivables, Individually evaluated for impairment 263  
Loans and financing receivables, Collectively evaluated for impairment 105,504 113,460
Dairy and Livestock/ Agribusiness [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 17,278 36,061
Allowance for loan losses, Charge-offs (1,150) (3,291)
Allowance for loan losses, Recoveries 166 151
Allowance for loan losses, Provision/reallocation of ALLL 2,450 (15,643)
Allowance for loan losses, Ending balance 18,696 17,278
Allowance for loan losses, Individually evaluated for impairment 1,596 1,371
Allowance for loan losses, Collectively evaluated for impairment 17,100 15,907
Ending balance, December 31, 2012 336,660 347,677
Loans and financing receivables, Individually evaluated for impairment 16,709 10,251
Loans and financing receivables, Collectively evaluated for impairment 319,951 337,426
Consumer, Auto & Other [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 1,590 1,034
Allowance for loan losses, Charge-offs (283) (511)
Allowance for loan losses, Recoveries 36 200
Allowance for loan losses, Provision/reallocation of ALLL (221) 867
Allowance for loan losses, Ending balance 1,170 1,590
Allowance for loan losses, Individually evaluated for impairment 11 93
Allowance for loan losses, Collectively evaluated for impairment 1,159 1,497
Ending balance, December 31, 2012 60,273 68,806
Loans and financing receivables, Individually evaluated for impairment 215 478
Loans and financing receivables, Collectively evaluated for impairment 60,058 68,328
Unallocated [Member]
   
Debt And Capital Lease Obligations [Line Items]    
Allowance for loan losses, Beginning balance 5,219 803
Allowance for loan losses, Provision/reallocation of ALLL 920 4,416
Allowance for loan losses, Ending balance 6,139 5,219
Allowance for loan losses, Collectively evaluated for impairment $ 6,139 $ 5,219