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Note 17 - Consolidated Quarterly Financial Information (unaudited) (Detail) - Selected Quarterly Financial Data (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Total interest income | $ 39,001 |  | $ 44,040 |  | $ 46,514
Total interest expense | 6,346 |  | 10,169 |  | 13,547
Net interest income | 32,655 |  | 33,871 |  | 32,967
Provision for loan losses | 1,583 |  | 4,896 |  | 5,871
Noninterest income | 8,483 |  | 7,222 |  | 6,154
Noninterest expense | 29,741 |  | 28,299 |  | 26,643
Earnings per share (in Dollars per share) | $ 1.75 |  | $ 1.46 |  | $ 1.28
First Quarter [Member] |  |  |  |  |
Total interest income | 10,665 |  | 12,025 |  | 12,228
Total interest expense | 1,753 |  | 2,822 |  | 3,619
Net interest income | 8,912 |  | 9,203 |  | 8,609
Provision for loan losses | 1,316 | [1] | 2,944 | [2] | 921
Noninterest income | 3,479 |  | 3,659 |  | 1,865
Noninterest expense | 7,332 |  | 7,098 |  | 6,881
Net income | 2,622 |  | 2,033 |  | 1,906
Earnings per share (in Dollars per share) | $ 0.65 |  | $ 0.51 |  | $ 0.48
Second Quarter [Member] |  |  |  |  |
Total interest income | 9,657 |  | 10,817 |  | 11,599
Total interest expense | 1,604 |  | 2,663 |  | 3,421
Net interest income | 8,053 |  | 8,154 |  | 8,178
Provision for loan losses | 524 | [1] | 759 | [2] | 721
Noninterest income | 1,974 |  | 1,687 |  | 1,524
Noninterest expense | 7,162 |  | 6,981 |  | 6,976
Net income | 1,719 |  | 1,555 |  | 1,471
Earnings per share (in Dollars per share) | $ 0.43 |  | $ 0.39 |  | $ 0.37
Third Quarter [Member] |  |  |  |  |
Total interest income | 9,405 |  | 10,693 |  | 11,438
Total interest expense | 1,538 |  | 2,509 |  | 3,328
Net interest income | 7,867 |  | 8,184 |  | 8,110
Provision for loan losses | 1,183 | [1] | 1,152 | [2] | 2,225
Noninterest income | 1,674 |  | 1,058 |  | 1,382
Noninterest expense | 6,957 |  | 7,001 |  | 6,863
Net income | 1,107 |  | 886 |  | 421
Earnings per share (in Dollars per share) | $ 0.27 |  | $ 0.22 |  | $ 0.10
Fourth Quarter [Member] |  |  |  |  |
Total interest income | 9,274 |  | 10,505 |  | 11,249
Total interest expense | 1,451 |  | 2,175 |  | 3,179
Net interest income | 7,823 |  | 8,330 |  | 8,070
Provision for loan losses | (1,440) | [1] | 41 | [2] | 2,004
Noninterest income | 1,356 |  | 818 |  | 1,383
Noninterest expense | 8,290 |  | 7,219 |  | 5,923
Net income | $ 1,604 |  | $ 1,361 |  | $ 1,298
Earnings per share (in Dollars per share) | $ 0.40 |  | $ 0.34 |  | $ 0.33
[1] | During the first quarter of 2011, the Company began taking partial charge-offs more quickly on collateral dependent impaired loans as a result of management's evaluation of the trends in the real estate market, the status of long-term, collateral dependent impaired loans and the current regulatory environment. The increases in partial charge-offs contributed to a higher historical loan loss factor, which required additional general allocations within the allowance for loan losses.
[2] | During the third and fourth quarters of 2010, the Bank experienced an increase in its provision expense as a result of continued credit quality issues with three commercial relationships that resulted in additional impairment charges and partial charge-offs.

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