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Note 7 - Loans (Detail) - Troubled Debt Restructuring by Type of Concession and Type of Loans (Accruing Troubled Debt Restructuring Member, USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Accruing TDRs | $ 130,215 | $ 144,695
Principal Deferral [Member] | Commercial Loans Member |  |
Accruing TDRs | 491 | 531
Principal Deferral [Member] | Real Estate Construction Loans [Member] |  |
Accruing TDRs | 0 | 0
Principal Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Accruing TDRs | 27,565 | 27,003
Principal Deferral [Member] | Residential Construction [Member] |  |
Accruing TDRs | 1,455 | 1,461
Principal Deferral [Member] |  |
Accruing TDRs | 29,511 | 28,995
Rate Reduction [Member] | Commercial Loans Member |  |
Accruing TDRs | 2,994 | 3,020
Rate Reduction [Member] | Real Estate Construction Loans [Member] |  |
Accruing TDRs | 0 | 0
Rate Reduction [Member] | Commercial Mortgage Loans [Member] |  |
Accruing TDRs | 16,153 | 16,656
Rate Reduction [Member] | Residential Construction [Member] |  |
Accruing TDRs | 1,604 | 1,024
Rate Reduction [Member] |  |
Accruing TDRs | 20,751 | 20,700
Rate Reduction and Payment Deferral [Member] | Commercial Loans Member |  |
Accruing TDRs | 2,797 | 413
Rate Reduction and Payment Deferral [Member] | Real Estate Construction Loans [Member] |  |
Accruing TDRs | 5,834 | 5,834
Rate Reduction and Payment Deferral [Member] | Commercial Mortgage Loans [Member] |  |
Accruing TDRs | 67,812 | 85,783
Rate Reduction and Payment Deferral [Member] | Residential Construction [Member] |  |
Accruing TDRs | 3,510 | 2,231
Rate Reduction and Payment Deferral [Member] |  |
Accruing TDRs | 79,953 | 94,261
Rate Reduction and Forgiveness of Principal [Member] | Commercial Loans Member |  |
Accruing TDRs |  | 0
Rate Reduction and Forgiveness of Principal [Member] | Real Estate Construction Loans [Member] |  |
Accruing TDRs |  | 0
Rate Reduction and Forgiveness of Principal [Member] | Commercial Mortgage Loans [Member] |  |
Accruing TDRs |  | 739
Rate Reduction and Forgiveness of Principal [Member] | Residential Construction [Member] |  |
Accruing TDRs |  | 0
Rate Reduction and Forgiveness of Principal [Member] |  |
Accruing TDRs |  | 739
Commercial Loans Member |  |
Accruing TDRs | 6,282 | 3,964
Real Estate Construction Loans [Member] |  |
Accruing TDRs | 5,834 | 5,834
Commercial Mortgage Loans [Member] |  |
Accruing TDRs | 111,530 | 130,181
Residential Construction [Member] |  |
Accruing TDRs | $ 6,569 | $ 4,716

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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant