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Note 5 - Loans (Detail) - Aging of Loan Portfolio (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Total | $ 7,429,147 | $ 7,059,212
Commercial Loans Member |  |
30-59 Days Past Due | 16,832 | 1,683
60-89 Days Past Due | 1,610 | 0
Greater than 90 Days Past Due | 630 | 0
Non-accrual Loans | 19,958 | 30,661
Total Past Due | 39,030 | 32,344
Loans Not Past Due | 2,088,077 | 1,835,931
Total | 2,127,107 | 1,868,275
Real Estate Construction Loans [Member] |  |
30-59 Days Past Due |  | 20,326
60-89 Days Past Due | 1,471 | 0
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 36,299 | 46,012
Total Past Due | 37,770 | 66,338
Loans Not Past Due | 143,180 | 171,034
Total | 180,950 | 237,372
Commercial Mortgage Loans [Member] |  |
30-59 Days Past Due | 21,570 | 13,627
60-89 Days Past Due | 3,627 | 20,277
Greater than 90 Days Past Due | 0 | 6,726
Non-accrual Loans | 35,704 | 107,784
Total Past Due | 60,901 | 148,414
Loans Not Past Due | 3,707,551 | 3,600,483
Total | 3,768,452 | 3,748,897
Residential Mortgage And Equity Lines Member |  |
30-59 Days Past Due | 5,324 | 5,871
60-89 Days Past Due | 1,972 | 0
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 11,941 | 16,740
Total Past Due | 19,237 | 22,611
Loans Not Past Due | 1,320,845 | 1,164,358
Total | 1,340,082 | 1,186,969
Installment And Other Loans Member |  |
30-59 Days Past Due | 0 | 0
60-89 Days Past Due |  | 0
Greater than 90 Days Past Due | 0 | 0
Non-accrual Loans | 0 | 0
Total Past Due |  | 0
Loans Not Past Due | 12,556 | 17,699
Total | 12,556 | 17,699
Total [Member] |  |
30-59 Days Past Due | 43,726 | 41,507
60-89 Days Past Due | 8,680 | 20,277
Greater than 90 Days Past Due | 630 | 6,726
Non-accrual Loans | 103,902 | 201,197
Total Past Due | 156,938 | 269,707
Loans Not Past Due | 7,272,209 | 6,789,505
Total | $ 7,429,147 | $ 7,059,212

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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=7512638&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=7512638&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=7512638&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=7512638&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=7512638&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=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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