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Loan and Lease Finance Receivables and Allowance for Credit Losses - Loans Modified as Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
SecurityLoan
Dec. 31, 2011
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 32 25
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 38,126 $ 56,592
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 38,126 56,290
Troubled debt restructurings, Outstanding Recorded Investment 35,847 49,851
Non-Covered Loans [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 31 25
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 37,221 56,592
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 37,221 56,290
Troubled debt restructurings, Outstanding Recorded Investment 34,956 49,851
Covered Loans [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 1   
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 905   
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 905   
Troubled debt restructurings, Outstanding Recorded Investment 891   
Commercial and Industrial [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 9 5
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 2,381 1,673
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 2,381 1,372
Troubled debt restructurings, Outstanding Recorded Investment 1,883 1,224
Construction - speculative [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 1 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 10,966 16,886
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 10,966 16,886
Troubled debt restructurings, Outstanding Recorded Investment 10,663 15,394
Construction - non-speculative [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans    1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment    9,219
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment    9,219
Troubled debt restructurings, Outstanding Recorded Investment    9,219
Commercial real estate - owner occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 6 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 4,225 3,195
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 4,225 3,195
Troubled debt restructurings, Outstanding Recorded Investment 3,903 3,067
Commercial real estate - non-owner occupied [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 5 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 9,284 11,707
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 9,284 11,707
Troubled debt restructurings, Outstanding Recorded Investment 8,662 10,236
Residential real estate (SFR 1-4) [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 1 6
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 399 2,162
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 399 2,161
Troubled debt restructurings, Outstanding Recorded Investment 398 2,049
Dairy and livestock [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 7 5
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 9,447 11,750
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 9,447 11,750
Troubled debt restructurings, Outstanding Recorded Investment 9,184 8,662
Municipal lease finance receivables [Member]
    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans 2  
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment 519  
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 519  
Troubled debt restructurings, Outstanding Recorded Investment $ 263