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Note 7 - Loans (Detail) - Impaired Loans and Related Allowance For Credit Losses (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
With allocated allowance |  |
Allowance | $ 17,357 | $ 12,183
Total impaired loans | 295,878 | 323,786
Total impaired loans | 230,544 | 248,597
Total impaired loans | 17,357 | 12,183
Commercial Loans Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 14,437 | 29,359
Loans with no related allowance recorded investment | 12,294 | 18,963
Real Estate Construction Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 9,304 | 9,304
Loans with no related allowance recorded investment | 7,277 | 7,277
Commercial Mortgage Loans [Member] |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 153,872 | 189,871
Loans with no related allowance recorded investment | 120,563 | 152,957
Residential Mortgage And Equity Lines Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 3,643 | 4,303
Loans with no related allowance recorded investment | 3,633 | 4,229
With No Allocated Allowance Member |  |
With no allocated allowance |  |
Loans with no related allowance unpaid principal balance | 181,256 | 232,837
Loans with no related allowance recorded investment | 143,767 | 183,426
Commercial Loans Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 11,854 | 7,804
Loans with related allowance recorded investment | 7,180 | 4,959
Allowance | 1,717 | 1,467
Total impaired loans | 1,717 | 1,467
Real Estate Construction Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 54,657 | 54,718
Loans with related allowance recorded investment | 34,795 | 34,856
Allowance | 8,080 | 8,158
Total impaired loans | 8,080 | 8,158
Commercial Mortgage Loans [Member] |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 31,407 | 14,163
Loans with related allowance recorded investment | 30,187 | 12,928
Allowance | 6,242 | 1,336
Total impaired loans | 6,242 | 1,336
Residential Mortgage And Equity Lines Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 16,704 | 14,264
Loans with related allowance recorded investment | 14,615 | 12,428
Allowance | 1,318 | 1,222
Total impaired loans | 1,318 | 1,222
With Allocated Allowance Member |  |
With allocated allowance |  |
Loans with related allowance unpaid principal balance | 114,622 | 90,949
Loans with related allowance recorded investment | 86,777 | 65,171
Allowance | 17,357 | 12,183
Total impaired loans | $ 17,357 | $ 12,183

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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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