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Note 7 - Loans (Detail) - Average Balance And Interest Income Recognized Related To Impaired Loans (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Impaired Loans - Average Recorded Investment | $ 244,248 | $ 314,179
Impaired Loans - Interest Income Recognized | 1,895 | 1,561
Commercial Loans Member |  |
Impaired Loans - Average Recorded Investment | 22,126 | 45,142
Impaired Loans - Interest Income Recognized | 183 | 257
Real Estate Construction Loans [Member] |  |
Impaired Loans - Average Recorded Investment | 42,068 | 66,455
Impaired Loans - Interest Income Recognized | 66 | 176
Commercial Mortgage Loans [Member] |  |
Impaired Loans - Average Recorded Investment | 162,257 | 184,867
Impaired Loans - Interest Income Recognized | 1,562 | 1,088
Residential Mortgage And Equity Lines Member |  |
Impaired Loans - Average Recorded Investment | 17,797 | 17,715
Impaired Loans - Interest Income Recognized | $ 84 | $ 40

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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