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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 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | $ 23,362 | $ 12,183
Individually Evaluated - Balance | 215,801 | 248,597
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 158,090 | 171,139
Collectively Evaluated - Balance | 7,616,212 | 7,180,550
Total allowance | 181,452 | 183,322
Total balance | 7,832,013 | 7,429,147
Commercial Loans [Member] |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 10,849 | 1,467
Individually Evaluated - Balance | 35,051 | 23,922
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 55,887 | 64,634
Collectively Evaluated - Balance | 2,202,851 | 2,103,185
Total allowance | 66,736 | 66,101
Total balance | 2,237,902 | 2,127,107
Real Estate Construction Loans [Member] |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 5,691 | 8,158
Individually Evaluated - Balance | 34,829 | 42,133
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 10,960 | 14,859
Collectively Evaluated - Balance | 155,038 | 138,817
Total allowance | 16,651 | 23,017
Total balance | 189,867 | 180,950
Commercial Mortgage Loans [Member] |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 6,129 | 1,336
Individually Evaluated - Balance | 128,855 | 165,885
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 79,959 | 81,137
Collectively Evaluated - Balance | 3,792,493 | 3,602,567
Total allowance | 86,088 | 82,473
Total balance | 3,921,348 | 3,768,452
Residential Mortgage And Equity Lines Member |  |
Loans individually evaluated for impairment |  |
Individually Evaluated - Allowance | 693 | 1,222
Individually Evaluated - Balance | 17,066 | 16,657
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 11,249 | 10,481
Collectively Evaluated - Balance | 1,450,581 | 1,323,425
Total allowance | 11,942 | 11,703
Total balance | 1,467,647 | 1,340,082
Installment And Other Loans [Member] |  |
Loans collectively evaluated for impairment |  |
Collectively Evaluated - Allowance | 35 | 28
Collectively Evaluated - Balance | 15,249 | 12,556
Total allowance | 35 | 28
Total balance | $ 15,249 | $ 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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