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Note 5 - Loans (Detail) - Troubled Debt Restructurings Modified (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
No. of Loans | 61 | 32 |
Specific Reserve | $ 12,183,000 | $ 7,554,000 |
Charge-off | 46,000 |  |
Commercial Loans Member | Accruing Troubled Debt Restructuring Member |  |  |
No. of Loans | 9 | 7 |
Pre-Modification Recorded Investment | 3,646,000 | 15,025,000 |
Post-Modification Recorded Investment | 3,646,000 | 15,025,000 |
Specific Reserve | 1,213,000 | 104,000 |
Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring Member |  |  |
No. of Loans | 20 | 6 |
Pre-Modification Recorded Investment | 62,118,000 | 17,343,000 |
Post-Modification Recorded Investment | 58,393,000 | 14,294,000 |
Specific Reserve | 27,000 | 1,000 |
Charge-off | 3,725,000 | 3,049,000 |
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring Member |  |  |
No. of Loans | 14 | 3 |
Pre-Modification Recorded Investment | 4,305,000 | 1,574,000 |
Post-Modification Recorded Investment | 4,223,000 | 1,574,000 |
Specific Reserve | 162,000 | 114,000 |
Charge-off | 82,000 |  |
Total [Member] | Accruing Troubled Debt Restructuring Member |  |  |
No. of Loans | 43 | 19 |
Pre-Modification Recorded Investment | 70,069,000 | 67,611,000 |
Post-Modification Recorded Investment | 66,262,000 | 52,415,000 |
Specific Reserve | 1,402,000 | 219,000 |
Charge-off | 3,807,000 | 15,196,000 |
Real Estate Construction Loans [Member] | Accruing Troubled Debt Restructuring Member |  |  |
No. of Loans |  | 3 |
Pre-Modification Recorded Investment |  | 33,669,000 |
Post-Modification Recorded Investment |  | 21,522,000 |
Charge-off |  | 12,147,000 |
Accruing Troubled Debt Restructuring Member |  |  |
Post-Modification Recorded Investment | 144,695,000 | 120,016,000 | 136,800,000
Charge-off | $ (251,000) | $ (2,341,000) |

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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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Balance Type: | debit
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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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