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Note 7 - Loans (Details) - Aging of Loan Portfolio (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total | $ 7,832,013 | $ 7,429,147
Commercial Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 17,034 | 16,832
60-89 Days Past Due | 4,136 | 1,610
Greater than 90 Days Past Due |  | 630
Non-accrual Loans | 24,506 | 19,958
Total Past Due | 45,676 | 39,030
Loans Not Past Due | 2,192,226 | 2,088,077
Total | 2,237,902 | 2,127,107
Real Estate Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 0 | 0
60-89 Days Past Due | 0 | 1,471
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 28,995 | 36,299
Total Past Due | 28,995 | 37,770
Loans Not Past Due | 160,872 | 143,180
Total | 189,867 | 180,950
Commercial Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 2,396 | 21,570
60-89 Days Past Due | 262 | 3,627
Greater than 90 Days Past Due | 499 | 0
Non-accrual Loans | 35,996 | 35,704
Total Past Due | 39,153 | 60,901
Loans Not Past Due | 3,882,195 | 3,707,551
Total | 3,921,348 | 3,768,452
Residential Mortgage And Equity Lines Member |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 3,310 | 5,324
60-89 Days Past Due | 2,237 | 1,972
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 10,364 | 11,941
Total Past Due | 15,911 | 19,237
Loans Not Past Due | 1,451,736 | 1,320,845
Total | 1,467,647 | 1,340,082
Installment And Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 208 | 0
60-89 Days Past Due | 0 | 0
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 0 | 0
Total Past Due | 208 | 0
Loans Not Past Due | 15,041 | 12,556
Total | 15,249 | 12,556
Total [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-59 Days Past Due | 22,948 | 43,726
60-89 Days Past Due | 6,635 | 8,680
Greater than 90 Days Past Due | 499 | 630
Non-accrual Loans | 99,861 | 103,902
Total Past Due | 129,943 | 156,938
Loans Not Past Due | 7,702,070 | 7,272,209
Total | $ 7,832,013 | $ 7,429,147

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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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