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Note 7 - Loans (Details) - Allowance For Loan Losses By Portfolio Segment And Based On Impairment Method (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | $ 12,779 | $ 12,183
Individually Evaluated - Balance | 211,077 | 248,597
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 166,954 | 171,139
Collectively Evaluated - Balance | 7,483,296 | 7,180,550
Total allowance | 179,733 | 183,322
Total balance | 7,694,373 | 7,429,147
Commercial Loans Member |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 1,568 | 1,467
Individually Evaluated - Balance | 20,263 | 23,922
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 62,811 | 64,634
Collectively Evaluated - Balance | 2,190,498 | 2,103,185
Total allowance | 64,379 | 66,101
Total balance | 2,210,761 | 2,127,107
Real Estate Construction Loans [Member] |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 4,995 | 8,158
Individually Evaluated - Balance | 35,288 | 42,133
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 8,760 | 14,859
Collectively Evaluated - Balance | 118,375 | 138,817
Total allowance | 13,755 | 23,017
Total balance | 153,663 | 180,950
Commercial Mortgage Loans [Member] |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 5,342 | 1,336
Individually Evaluated - Balance | 137,970 | 165,885
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 84,336 | 81,137
Collectively Evaluated - Balance | 3,771,589 | 3,602,567
Total allowance | 89,678 | 82,473
Total balance | 3,909,559 | 3,768,452
Residential Mortgage And Equity Lines Member |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 874 | 1,222
Individually Evaluated - Balance | 17,556 | 16,657
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 11,018 | 10,481
Collectively Evaluated - Balance | 1,389,991 | 1,323,425
Total allowance | 11,892 | 11,703
Total balance | 1,407,547 | 1,340,082
Installment And Other Loans Member |  |
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 29 | 28
Collectively Evaluated - Balance | 12,843 | 12,556
Total allowance | 29 | 28
Total balance | $ 12,843 | $ 12,556

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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