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Note 7 - Loans (Details) - Aging of Loan Portfolio (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | $ 8,302,282 | $ 8,084,563
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 11,386 | 7,170
60-89 Days Past Due | 610 | 16,562
Non-accrual Loans | 13,806 | 21,232
Total Past Due | 25,802 | 44,964
Loans Not Past Due | 2,204,078 | 2,253,760
Total | 2,229,880 | 2,298,724
Real Estate Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 3,140 |
Non-accrual Loans | 28,042 | 28,586
Total Past Due | 31,182 | 28,586
Loans Not Past Due | 222,650 | 193,115
Total | 253,832 | 221,701
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 62,014 | 20,043
60-89 Days Past Due |  | 7,862
Greater than 90 Days Past Due | 974 | 982
Non-accrual Loans | 17,042 | 19,621
Total Past Due | 80,030 | 48,508
Loans Not Past Due | 4,112,957 | 3,974,543
Total | 4,192,987 | 4,023,051
Residential Mortgage And Equity Lines Member |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 5,881 | 3,508
60-89 Days Past Due |  | 832
Non-accrual Loans | 11,498 | 13,744
Total Past Due | 17,379 | 18,084
Loans Not Past Due | 1,596,246 | 1,508,448
Total | 1,613,625 | 1,526,532
Installment And Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due |  | 100
Total Past Due |  | 100
Loans Not Past Due | 11,958 | 14,455
Total | 11,958 | 14,555
Total [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 82,421 | 30,821
60-89 Days Past Due | 610 | 25,256
Greater than 90 Days Past Due | 974 | 982
Non-accrual Loans | 70,388 | 83,183
Total Past Due | 154,393 | 140,242
Loans Not Past Due | 8,147,889 | 7,944,321
Total | $ 8,302,282 | $ 8,084,563

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- Definition Financing Receivable Recorded Investment Not In Past Due + References No definition available. + Details
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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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