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Note 5 - Loans (Detail) - Impaired Loans and Related Allowance For Credit Losses (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
With allocated allowance |  |
Allowance | $ 12,183,000 | $ 7,554,000
Total impaired loans | 323,786,000 | 432,973,000
Total impaired loans | 248,597,000 | 321,973,000
Total impaired loans | 12,183,000 | 7,554,000
Commercial Loans Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 29,359,000 | 46,671,000
Loans with no related allowance recorded investment | 18,963,000 | 38,194,000
Real Estate Construction Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 9,304,000 | 134,837,000
Loans with no related allowance recorded investment | 7,277,000 | 78,767,000
Commercial Mortgage Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 189,871,000 | 187,580,000
Loans with no related allowance recorded investment | 152,957,000 | 149,034,000
Residential Mortgage And Equity Lines Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 4,303,000 | 8,555,000
Loans with no related allowance recorded investment | 4,229,000 | 7,987,000
With No Allocated Allowance Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 232,837,000 | 377,643,000
Loans with no related allowance recorded investment | 183,426,000 | 273,982,000
Commercial Loans Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 7,804,000 | 11,795,000
Loans with related allowance recorded investment | 4,959,000 | 7,587,000
Allowance | 1,467,000 | 3,336,000
Total impaired loans | 1,467,000 | 3,336,000
Real Estate Construction Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 54,718,000 |
Loans with related allowance recorded investment | 34,856,000 |
Allowance | 8,158,000 |
Total impaired loans | 8,158,000 |
Commercial Mortgage Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 14,163,000 | 29,722,000
Loans with related allowance recorded investment | 12,928,000 | 28,023,000
Allowance | 1,336,000 | 2,969,000
Total impaired loans | 1,336,000 | 2,969,000
Residential Mortgage And Equity Lines Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 14,264,000 | 13,813,000
Loans with related allowance recorded investment | 12,428,000 | 12,381,000
Allowance | 1,222,000 | 1,249,000
Total impaired loans | 1,222,000 | 1,249,000
With Allocated Allowance Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 90,949,000 | 55,330,000
Loans with related allowance recorded investment | 65,171,000 | 47,991,000
Allowance | 12,183,000 | 7,554,000
Total impaired loans | $ 12,183,000 | $ 7,554,000

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + 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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