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Loan and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Non-Covered Past Due and Nonaccrual Loans and Loans Past Due by Class of Loans (Detail) (Non-Covered Loans [Member], USD $)
Dec. 31, 2012
Dec. 31, 2011
30-59 Days Past Due $ 422,000 $ 5,020,000
60-89 Days Past Due 465,000 436,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 887,000 5,456,000
Nonaccrual 57,997,000 62,672,000
Current 3,200,354,000 3,157,342,000
Total Loans and Financing Receivables 3,259,238,000 3,225,470,000
Commercial and Industrial [Member]
    
30-59 Days Past Due 233,000 2,872,000
60-89 Days Past Due 457,000 150,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 690,000 3,022,000
Nonaccrual 3,136,000 3,432,000
Current 543,596,000 487,845,000
Total Loans and Financing Receivables 547,422,000 494,299,000
Construction - speculative [Member]
    
90+ Days Past Due and Accruing      
Nonaccrual 10,663,000 13,317,000
Current 27,231,000 42,203,000
Total Loans and Financing Receivables 37,894,000 55,520,000
Construction - non-speculative [Member]
    
90+ Days Past Due and Accruing      
Current 21,827,000 20,626,000
Total Loans and Financing Receivables 21,827,000 20,626,000
Commercial real estate - owner occupied [Member]
    
30-59 Days Past Due   133,000
60-89 Days Past Due   280,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing   413,000
Nonaccrual 5,415,000 9,474,000
Current 698,552,000 690,071,000
Total Loans and Financing Receivables 703,967,000 699,958,000
Commercial real estate - non-owner occupied [Member]
    
30-59 Days Past Due   374,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing   374,000
Nonaccrual 15,624,000 16,518,000
Current 1,270,516,000 1,231,442,000
Total Loans and Financing Receivables 1,286,140,000 1,248,334,000
Residential real estate (SFR 1-4) [Member]
    
30-59 Days Past Due 107,000 1,568,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 107,000 1,568,000
Nonaccrual 13,102,000 16,970,000
Current 146,079,000 157,904,000
Total Loans and Financing Receivables 159,288,000 176,442,000
Dairy and livestock [Member]
    
90+ Days Past Due and Accruing      
Nonaccrual 9,842,000 2,475,000
Current 317,737,000 340,875,000
Total Loans and Financing Receivables 327,579,000 343,350,000
Agribusiness [Member]
    
90+ Days Past Due and Accruing      
Current 9,081,000 4,327,000
Total Loans and Financing Receivables 9,081,000 4,327,000
Municipal lease finance receivables [Member]
    
90+ Days Past Due and Accruing      
Current 105,767,000 113,460,000
Total Loans and Financing Receivables 105,767,000 113,460,000
Consumer [Member]
    
30-59 Days Past Due 74,000 59,000
60-89 Days Past Due 8,000  
90+ Days Past Due and Accruing      
Total Past Due and Accruing 82,000 59,000
Nonaccrual 215,000 382,000
Current 47,260,000 50,995,000
Total Loans and Financing Receivables 47,557,000 51,436,000
Auto and equipment leases [Member]
    
30-59 Days Past Due 8,000 14,000
60-89 Days Past Due   6,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 8,000 20,000
Nonaccrual   104,000
Current 12,708,000 17,246,000
Total Loans and Financing Receivables 12,716,000 17,370,000
Total Non-covered loans excluding held-for-sale [Member]
    
30-59 Days Past Due 422,000 5,020,000
60-89 Days Past Due 465,000 436,000
90+ Days Past Due and Accruing      
Total Past Due and Accruing 887,000 5,456,000
Nonaccrual 57,997,000 62,672,000
Current 3,200,354,000 3,156,994,000
Total Loans and Financing Receivables 3,259,238,000 3,225,122,000
Loans held-for-sale [Member]
    
90+ Days Past Due and Accruing      
Current   348,000
Total Loans and Financing Receivables   $ 348,000