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Note 7 - Loans And Related Allowance For Loan Losses (Detail) - Past Due Financing Receivables (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable Current $ 389,477 $ 391,032
Financing Receivable 30-59 Days Past Due 6,237 3,589
Financing Receivable 60-89 Days Past Due 888 1,561
Financing Receivable 90 Days + Past Due 361 438
Financing Receivable Total Past Due 7,486 5,588
Financing Receivable Non-Accrual 10,091 11,813
Financing Receivable 407,054 408,433
Commercial and Industrial [Member]
    
Financing Receivable Current 53,319 60,428
Financing Receivable 30-59 Days Past Due 1,545 441
Financing Receivable 60-89 Days Past Due 156 63
Financing Receivable 90 Days + Past Due   348
Financing Receivable Total Past Due 1,701 852
Financing Receivable Non-Accrual 381 908
Financing Receivable 55,401 62,188
Real Estate Construction [Member]
    
Financing Receivable Current 22,669 22,158
Financing Receivable 30-59 Days Past Due   0
Financing Receivable 60-89 Days Past Due 0 0
Financing Receivable 90 Days + Past Due 0 0
Financing Receivable Total Past Due   0
Financing Receivable Non-Accrual 148 364
Financing Receivable 22,817 22,522
Residential Real Estate Mortgage [Member]
    
Financing Receivable Current 185,879 191,349
Financing Receivable 30-59 Days Past Due 3,976 2,614
Financing Receivable 60-89 Days Past Due 613 1,401
Financing Receivable 90 Days + Past Due 361 90
Financing Receivable Total Past Due 4,950 4,105
Financing Receivable Non-Accrual 8,234 8,418
Financing Receivable 199,063 203,872
Commercial Real Estate Mortgage [Member]
    
Financing Receivable Current 123,720 113,023
Financing Receivable 30-59 Days Past Due 650 509
Financing Receivable 60-89 Days Past Due 115 97
Financing Receivable 90 Days + Past Due 0 0
Financing Receivable Total Past Due 765 606
Financing Receivable Non-Accrual 1,314 2,105
Financing Receivable 125,799 115,734
Consumer Installment [Member]
    
Financing Receivable Current 3,890 4,074
Financing Receivable 30-59 Days Past Due 66 25
Financing Receivable 60-89 Days Past Due 4 0
Financing Receivable 90 Days + Past Due 0 0
Financing Receivable Total Past Due 70 25
Financing Receivable Non-Accrual 14 18
Financing Receivable $ 3,974 $ 4,117