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Non-Covered Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in, and Aging of, Non-Covered Past Due and Nonaccrual Loans by Class of Loans (Detail) (Non-Covered Loans [Member], USD $)
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due $ 688,000 $ 2,271,000
60-89 Days Past Due    1,028,000
Total Past Due and Accruing 688,000 3,299,000
Nonaccrual 37,050,000 39,954,000
Current 3,545,009,000 3,351,897,000
Gross non-covered loans 3,582,747,000 3,395,150,000
Commercial and industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 673,000 900,000
60-89 Days Past Due    93,000
Total Past Due and Accruing 673,000 993,000
Nonaccrual 6,666,000 3,861,000
Current 506,305,000 507,938,000
Gross non-covered loans 513,644,000 512,792,000
Commercial real estate Owner occupied [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due    220,000
60-89 Days Past Due      
Total Past Due and Accruing    220,000
Nonaccrual 4,034,000 4,105,000
Current 777,380,000 725,626,000
Gross non-covered loans 781,414,000 729,951,000
Commercial real estate Non-owner occupied [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due    303,000
60-89 Days Past Due      
Total Past Due and Accruing    303,000
Nonaccrual 10,761,000 8,305,000
Current 1,673,740,000 1,468,956,000
Gross non-covered loans 1,684,501,000 1,477,564,000
Construction Speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
Total Past Due and Accruing      
Nonaccrual 9,666,000 9,966,000
Current 33,754,000 17,812,000
Gross non-covered loans 43,420,000 27,778,000
Construction Non-speculative [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
Total Past Due and Accruing      
Nonaccrual      
Current 23,809,000 19,331,000
Gross non-covered loans 23,809,000 19,331,000
SFR mortgage [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due    773,000
60-89 Days Past Due    935,000
Total Past Due and Accruing    1,708,000
Nonaccrual 3,999,000 7,577,000
Current 189,206,000 179,948,000
Gross non-covered loans 193,205,000 189,233,000
Dairy & livestock and agribusiness [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
Total Past Due and Accruing      
Nonaccrual 1,463,000 5,739,000
Current 191,467,000 288,553,000
Gross non-covered loans 192,930,000 294,292,000
Municipal lease finance receivables [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
Total Past Due and Accruing      
Nonaccrual      
Current 80,013,000 89,106,000
Gross non-covered loans 80,013,000 89,106,000
Consumer and other loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
30-59 Days Past Due 15,000 75,000
60-89 Days Past Due      
Total Past Due and Accruing 15,000 75,000
Nonaccrual 461,000 401,000
Current 69,335,000 54,627,000
Gross non-covered loans $ 69,811,000 $ 55,103,000