Annual report pursuant to Section 13 and 15(d)

Loans - Analysis of Past Due Loans, Disaggregated by Loan Class (Detail)

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Loans - Analysis of Past Due Loans, Disaggregated by Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 6,687 $ 4,748
60-89 Days Past Due 3,175 9,199
90 Days or More Past Due 6,605 21,244
Total Past Due 16,467 35,191
Current 2,032,093 1,903,549
Total Loans 2,048,560 1,938,740
Accruing 90 Days or More Past Due      
Real Estate Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 888,872 749,920
Real Estate Loans [Member] | Retail [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due    485
60-89 Days Past Due 111   
90 Days or More Past Due      
Total Past Due 111 485
Current 392,834 311,972
Total Loans 392,945 312,457
Accruing 90 Days or More Past Due      
Real Estate Loans [Member] | Land [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
90 Days or More Past Due 335   
Total Past Due 335   
Current 13,672 7,769
Total Loans 14,007 7,769
Accruing 90 Days or More Past Due      
Real Estate Loans [Member] | Other [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
90 Days or More Past Due      
Total Past Due      
Current 380,142 342,797
Total Loans 380,142 342,797
Accruing 90 Days or More Past Due      
Real Estate Loans [Member] | Construction [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
90 Days or More Past Due    8,310
Total Past Due    8,310
Current    25,666
Total Loans    33,976
Accruing 90 Days or More Past Due      
Real Estate Loans [Member] | Residential Property [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due    277
60-89 Days Past Due 588 1,613
90 Days or More Past Due 311 2,221
Total Past Due 899 4,111
Current 100,879 48,810
Total Loans 101,778 52,921
Accruing 90 Days or More Past Due      
Commercial and Industrial Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,123,012 1,145,474
Commercial and Industrial Loans [Member] | Unsecured [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 918 438
60-89 Days Past Due 1,103 611
90 Days or More Past Due 1,279 1,833
Total Past Due 3,300 2,882
Current 106,872 148,398
Total Loans 110,172 151,280
Accruing 90 Days or More Past Due      
Commercial and Industrial Loans [Member] | Secured By Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,949 3,162
60-89 Days Past Due    6,496
90 Days or More Past Due 926 1,202
Total Past Due 2,875 10,860
Current 771,317 782,696
Total Loans 774,192 793,556
Accruing 90 Days or More Past Due      
Commercial and Industrial Loans [Member] | Commercial Lines of Credit [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due 188   
90 Days or More Past Due 416 416
Total Past Due 604 416
Current 55,517 55,354
Total Loans 56,121 55,770
Accruing 90 Days or More Past Due      
Commercial and Industrial Loans [Member] | SBA Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 3,759 260
60-89 Days Past Due 1,039 472
90 Days or More Past Due 2,800 7,108
Total Past Due 7,598 7,840
Current 140,708 108,352
Total Loans 148,306 116,192
Accruing 90 Days or More Past Due      
Commercial and Industrial Loans [Member] | International Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due      
60-89 Days Past Due      
90 Days or More Past Due      
Total Past Due     
Current 34,221 28,676
Total Loans 34,221 28,676
Accruing 90 Days or More Past Due      
Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 36,676 43,346
Consumer Loans [Member] | Consumer Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 61 126
60-89 Days Past Due 146 7
90 Days or More Past Due 538 154
Total Past Due 745 287
Current 35,931 43,059
Total Loans 36,676 43,346
Accruing 90 Days or More Past Due