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Note 4 - Loans and Allowance for Loan Losses (Detail) - Loans Individually Evaluated for Impairment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Unpaid Principal Balance |  |  | $ 426
With an allowance recorded: |  |  |
Recorded Investment |  |  | 1,979
Allowance for Loan Losses Allocated | 2,112 | 758 | 2,107
Unpaid Principal Balance | 18,831 | 17,786 | 19,277
Recorded Investment | 16,919 | 15,636 | 17,401
Allowance for Loan Losses Allocated | 2,112 | 758 | 2,107
Average Impaired Loans | 17,167 | 13,122 | 11,717
Interest Income Recognized | 216 | 243 | 864
Cash Basis Interest Recognized | 216 | 207 | 864
Residential Real Estate Loans [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance | 830 | 1,247 | 619
Recorded Investment | 686 | 1,055 | 407
Average Impaired Loans | 703 | 1,070 | 493
Interest Income Recognized | 3 | 7 |
Cash Basis Interest Recognized | 3 | 6 |
Residential Real Estate Loans [Member] | Related Allowance Recorded (Member) |  |  |
With an allowance recorded: |  |  |
Unpaid Principal Balance | 426 |  | 420
Recorded Investment | 426 |  | 420
Allowance for Loan Losses Allocated | 133 |  | 128
Average Impaired Loans | 423 |  | 420
Interest Income Recognized | 4 |  | 23
Cash Basis Interest Recognized | 4 |  | 23
Allowance for Loan Losses Allocated | 133 |  | 128
Commercial Real Estate Owner Occupied [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance | 5,644 | 9,984 | 5,528
Recorded Investment | 5,098 | 9,737 | 5,528
Average Impaired Loans | 5,313 | 7,604 | 4,729
Interest Income Recognized | 72 | 166 | 338
Cash Basis Interest Recognized | 72 | 143 | 338
Commercial Real Estate Owner Occupied [Member] | Related Allowance Recorded (Member) |  |  |
With an allowance recorded: |  |  |
Unpaid Principal Balance |  | 1,571 |
Recorded Investment |  | 1,571 |
Allowance for Loan Losses Allocated |  | 758 |
Average Impaired Loans |  | 996 |
Interest Income Recognized |  | 27 |
Cash Basis Interest Recognized |  | 18 |
Allowance for Loan Losses Allocated |  | 758 |
Commercial Real Estate Nonowner Occupied [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance | 7,849 | 3,440 | 10,085
Recorded Investment | 7,049 | 2,293 | 8,847
Average Impaired Loans | 7,052 | 2,458 | 4,767
Interest Income Recognized | 93 | 24 | 456
Cash Basis Interest Recognized | 93 | 22 | 456
Commercial Real Estate Nonowner Occupied [Member] | Related Allowance Recorded (Member) |  |  |
With an allowance recorded: |  |  |
Unpaid Principal Balance | 3,441 |  | 1,979
Recorded Investment | 3,441 |  | 1,979
Allowance for Loan Losses Allocated | 1,979 |  | 1,979
Average Impaired Loans | 3,456 |  | 1,132
Interest Income Recognized | 41 |  | 38
Cash Basis Interest Recognized | 41 |  | 38
Allowance for Loan Losses Allocated | 1,979 |  | 1,979
Commercial and Industrial [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance | 422 |  |
With an allowance recorded: |  |  |
Unpaid Principal Balance |  | 614 |
Recorded Investment |  | 329 |
Average Impaired Loans |  | 331 |
Interest Income Recognized |  | 10 |
Cash Basis Interest Recognized |  | 9 |
Home Equity Loans [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance | 219 | 220 | 220
Recorded Investment | 219 | 220 | 220
Average Impaired Loans | 220 | 110 | 176
Interest Income Recognized | 3 | 3 | 9
Cash Basis Interest Recognized | 3 | 3 | 9
Construction [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance |  | 674 |
Recorded Investment |  | 395 |
Average Impaired Loans |  | 535 |
Interest Income Recognized |  | 5 |
Cash Basis Interest Recognized |  | 5 |
Consumer Loans [Member] | No Related Allowance Recorded (Member) |  |  |
Unpaid Principal Balance |  | 36 |
Recorded Investment |  | 36 |
Average Impaired Loans |  | 18 |
Interest Income Recognized |  | 1 |
Cash Basis Interest Recognized |  | $ 1 |

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