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Note 5 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Impaired Loans - Average Recorded Investment | $ 277,776 | $ 361,353
Impaired Loans - Interest Income Recognized | 9,305 | 5,330
Commercial Loans Member |  |
Impaired Loans - Average Recorded Investment | 31,798 | 48,349
Impaired Loans - Interest Income Recognized | 580 | 1,053
Real Estate Construction Loans [Member] |  |
Impaired Loans - Average Recorded Investment | 49,094 | 82,529
Impaired Loans - Interest Income Recognized | 265 | 940
Commercial Mortgage Loans [Member] |  |
Impaired Loans - Average Recorded Investment | 178,822 | 212,555
Impaired Loans - Interest Income Recognized | 8,221 | 3,101
Residential Mortgage And Equity Lines Member |  |
Impaired Loans - Average Recorded Investment | 18,062 | 17,920
Impaired Loans - Interest Income Recognized | $ 239 | $ 236

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration