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Note 4 - Loans and Allowance for Loan Losses (Detail) - Aging of the Recorded Investment of Past Due Loans (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
30-59 Days Past Due $ 6,733 $ 5,733
60-89 Days Past Due 1,292 1,738
90 or More Days Past Due 7,118 3,125
Total Past Due 15,143 10,596
Loans Not Past Due 547,392 587,712
Total 562,535 598,308
Residential Real Estate Loans [Member]
    
30-59 Days Past Due 3,946 3,731
60-89 Days Past Due 1,007 1,144
90 or More Days Past Due 3,645 2,975
Total Past Due 8,598 7,850
Loans Not Past Due 221,151 230,640
Total 229,749 238,490
Commercial Real Estate Owner Occupied [Member]
    
30-59 Days Past Due 1,144 182
90 or More Days Past Due 758 125
Total Past Due 1,902 307
Loans Not Past Due 103,882 129,057
Total 105,784 129,364
Commercial Real Estate Nonowner Occupied [Member]
    
30-59 Days Past Due 52  
60-89 Days Past Due   232
90 or More Days Past Due 959  
Total Past Due 1,011 232
Loans Not Past Due 57,409 56,388
Total 58,420 56,620
Construction [Member]
    
30-59 Days Past Due 80 204
90 or More Days Past Due 1,519  
Total Past Due 1,599 204
Loans Not Past Due 19,564 21,267
Total 21,163 21,471
Commercial and Industrial [Member]
    
30-59 Days Past Due 90 171
60-89 Days Past Due   14
90 or More Days Past Due 36  
Total Past Due 126 185
Loans Not Past Due 47,103 45,015
Total 47,229 45,200
Automobile Loans [Member]
    
30-59 Days Past Due 593 864
60-89 Days Past Due 187 110
90 or More Days Past Due 59 13
Total Past Due 839 987
Loans Not Past Due 40,669 44,715
Total 41,508 45,702
Home Equity Loans [Member]
    
30-59 Days Past Due 182 75
60-89 Days Past Due   76
90 or More Days Past Due 96 5
Total Past Due 278 156
Loans Not Past Due 18,581 20,351
Total 18,859 20,507
Other Consumer Loans [Member]
    
30-59 Days Past Due 646 506
60-89 Days Past Due 98 162
90 or More Days Past Due 46 7
Total Past Due 790 675
Loans Not Past Due 39,033 40,279
Total $ 39,823 $ 40,954