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Note 6 - Loans And Related Allowance For Loan Losses (Detail) - Past Due Financing Receivables (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable Current $ 392,803 $ 380,379
Financing Receivable 30-59 Days Past Due 2,315 3,045
Financing Receivable 60-89 Days Past Due 833 1,332
Financing Receivable 90 Days + Past Due 89 319
Financing Receivable Total Past Due 3,237 4,696
Financing Receivable Non-Accrual 13,135 16,805
Financing Receivable 409,175 401,880
Commercial and Industrial [Member]
    
Financing Receivable Current 62,529 57,291
Financing Receivable 30-59 Days Past Due 1,221 258
Financing Receivable 60-89 Days Past Due 372 16
Financing Receivable 90 Days + Past Due 10 44
Financing Receivable Total Past Due 1,603 318
Financing Receivable Non-Accrual 1,191 1,576
Financing Receivable 65,323 59,185
Real Estate Construction [Member]
    
Financing Receivable Current 20,647 20,862
Financing Receivable 30-59 Days Past Due   20
Financing Receivable Total Past Due   20
Financing Receivable Non-Accrual 675 663
Financing Receivable 21,322 21,545
Residential Real Estate Mortgage [Member]
    
Financing Receivable Current 195,547 193,732
Financing Receivable 30-59 Days Past Due 885 2,624
Financing Receivable 60-89 Days Past Due 363 863
Financing Receivable 90 Days + Past Due   275
Financing Receivable Total Past Due 1,248 3,762
Financing Receivable Non-Accrual 8,638 10,645
Financing Receivable 205,433 208,139
Commercial Real Estate Mortgage [Member]
    
Financing Receivable Current 109,932 104,086
Financing Receivable 30-59 Days Past Due 140 83
Financing Receivable 60-89 Days Past Due 97 412
Financing Receivable 90 Days + Past Due 79  
Financing Receivable Total Past Due 316 495
Financing Receivable Non-Accrual 2,619 3,921
Financing Receivable 112,867 108,502
Consumer Installment [Member]
    
Financing Receivable Current 4,148 4,408
Financing Receivable 30-59 Days Past Due 69 60
Financing Receivable 60-89 Days Past Due 1 41
Financing Receivable Total Past Due 70 101
Financing Receivable Non-Accrual 12  
Financing Receivable $ 4,230 $ 4,509