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Note 16 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Securities available-for-sale |  |
Securities Available-for-Sale | $ 1,586,668 | $ 1,291,480
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 465,917 | 526,165
Total Assets | 465,917 | 526,165
Liabilities |  |
Total Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,120,751 | 765,315
Total Assets | 1,131,869 | 772,942
Liabilities |  |
Total Liabilities | 6,140 | 1,588
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
Total Assets | 30 | 104
Liabilities |  |
Total Liabilities | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,586,668 | 1,291,480
Total Assets | 1,597,816 | 1,299,211
Liabilities |  |
Total Liabilities | 6,140 | 1,588
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 460,193 | 509,971
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 0
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 460,193 | 509,971
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 460,193 | 509,971
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 952,815 | 416,694
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 952,815 | 416,694
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 952,814 | 416,694
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,106 | 10,168
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Collateralized Mortgage Obligations [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,106 | 10,168
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 6,106 | 10,168
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 123 | 141
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Asset-backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 123 | 141
Asset-backed Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 123 | 141
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 150,304 | 335,977
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 150,304 | 335,977
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 150,304 | 335,977
Mutual Funds Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 5,724 | 6,079
Mutual Funds Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Mutual Funds Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Mutual Funds Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 5,724 | 6,079
Mutual Funds Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 5,725 | 6,079
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 11,403 | 2,335
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Preferred Stock Of Government Sponsored Entities Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 11,403 | 2,335
Preferred Stock Of Government Sponsored Entities Member |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 11,403 | 2,335
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 465,917 | 10,115
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,120,751 | 0
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 0 | 0
Trust Preferred Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale | 1,586,668 | 10,115
Trust Preferred Securities [Member] |  |
Securities available-for-sale |  |
Securities Available-for-Sale |  | 10,115
Trading Securities Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 |
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 4,936 | 4,703
Trading Securities Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Trading Securities Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 4,936 | 4,703
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 30 | 104
Warrant [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 30 | 104
Option Contracts Member | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities |  | 0
Option Contracts Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities |  | 2
Option Contracts Member | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities |  | 0
Option Contracts Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities |  | 2
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 6,182 | 2,924
Liabilities |  |
Total Liabilities | 6,140 | 1,586
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 0 | 0
Liabilities |  |
Total Liabilities | 0 | 0
Foreign Exchange Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 6,182 | 2,924
Liabilities |  |
Total Liabilities | $ 6,140 | $ 1,586

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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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