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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | $ 1,743,309 | $ 1,291,480
Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 466,145 | 526,165
Total Assets | 466,145 | 526,165
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 1,277,164 | 765,315
Total Assets | 1,287,835 | 772,942
Total Liabilities | 4,726 | 1,588
Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Total Assets | 49 | 104
Total Liabilities | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 1,743,309 | 1,291,480
Total Assets | 1,754,029 | 1,299,211
Total Liabilities | 4,726 | 1,588
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 460,333 | 509,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 0
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 460,333 | 509,971
US Treasury Securities [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 460,333 | 509,971
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 1,095,019 | 416,694
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Mortgage-backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 1,095,019 | 416,694
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 6,697 | 10,168
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Collateralized Mortgage Obligations [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 6,697 | 10,168
Collateralized Mortgage Obligations [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 6,697 | 10,168
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 128 | 141
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Asset-backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 128 | 141
Asset-backed Securities [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 128 | 141
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 167,840 | 335,977
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 167,840 | 335,977
Corporate Debt Securities [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 167,840 | 335,977
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 5,812 | 6,079
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Mutual Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 5,812 | 6,079
Mutual Funds [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 5,812 | 6,079
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 7,480 | 2,335
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 7,480 | 2,335
Preferred Stock Of Government Sponsored Entities Member |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value | 7,480 | 2,335
Trading Securities Member | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 4,855 | 4,703
Trading Securities Member | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Trading Securities Member | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 4,855 | 4,703
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 49 | 104
Warrant [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 49 | 104
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 5,816 | 2,924
Total Liabilities | 4,725 | 1,586
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 5,816 | 2,924
Total Liabilities | 4,725 | 1,586
Option Contracts Member | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 |
Total Liabilities |  | 0
Option Contracts Member | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 1 |
Total Liabilities |  | 2
Option Contracts Member | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 0 |
Total Liabilities |  | 0
Option Contracts Member | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Total Assets | 1 |
Total Liabilities |  | 2
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 10,115
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 0
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 0
Trust Preferred Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | 10,115
Trust Preferred Securities [Member] |  |
Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis [Line Items] |  |
Available-for-sale Securities - Fair Value |  | $ 10,115

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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