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Note 7 - Loans (Detail) - Troubled Debt Restructurings Modified (USD $) | 12 Months Ended |  |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  |  |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member Commercial Loans Member | Mar. 31, 2012 Accruing Troubled Debt Restructuring Member Commercial Loans Member | Mar. 31, 2012 Accruing Troubled Debt Restructuring Member Commercial Mortgage Loans [Member] | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member Commercial Mortgage Loans [Member] | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member Residential Mortgage Loans [Member] | Mar. 31, 2012 Accruing Troubled Debt Restructuring Member Residential Mortgage Loans [Member] | Mar. 31, 2012 Accruing Troubled Debt Restructuring Member Total [Member] | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member Total [Member] | Mar. 31, 2013 Accruing Troubled Debt Restructuring Member | Dec. 31, 2012 Accruing Troubled Debt Restructuring Member | Mar. 31, 2012 Accruing Troubled Debt Restructuring Member | Dec. 31, 2011 Accruing Troubled Debt Restructuring Member
No. of Loans |  |  | 4 | 5 | 9 | 2 | 6 | 2 | 16 | 12 |  |  |  |
Pre-Modification Recorded Investment |  |  | $ 4,007,000 | $ 1,988,000 | $ 26,693,000 | $ 1,175,000 | $ 1,696,000 | $ 1,587,000 | $ 30,268,000 | $ 6,878,000 |  |  |  |
Post-Modification Recorded Investment |  |  | 4,007,000 | 1,988,000 | 23,375,000 | 1,175,000 | 1,696,000 | 1,587,000 | 26,950,000 | 6,878,000 | 130,215,000 | 144,695,000 | 143,233,000 | 120,016,000
Charge-offs | 0 |  |  |  | 3,318,000 |  |  |  | 3,318,000 |  |  |  |  |
Specific Reserve | $ 17,357,000 | $ 12,183,000 | $ 61,000 | $ 68,000 | $ 268,000 | $ 10,000 | $ 265,000 |  | $ 336,000 | $ 336,000 |  |  |  |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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