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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 | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | $ 1,578,897 | $ 1,586,668
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 481,576 | 465,917
Total Assets | 481,576 | 465,917
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 1,097,321 | 1,120,751
Total Assets | 1,102,417 | 1,131,869
Liabilities |  |
Total Liabilities | 3,324 | 6,140
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 28 | 30
Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 1,578,897 | 1,586,668
Total Assets | 1,584,021 | 1,597,816
Liabilities |  |
Total Liabilities | 3,324 | 6,140
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 475,259 | 460,193
US Treasury Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 475,259 | 460,193
US Treasury Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 475,259 | 460,193
Mortgage-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 921,153 | 952,815
Mortgage-backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 921,153 | 952,815
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 43 | 6,106
Collateralized Mortgage Obligations [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 43 | 6,106
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 43 | 6,106
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 162,681 | 150,304
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 162,681 | 150,304
Corporate Debt Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 162,681 | 150,304
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 5,757 | 5,724
Mutual Funds [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 5,757 | 5,724
Mutual Funds [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 5,757 | 5,725
Preferred Stock Of Government Sponsored Entities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 13,444 | 11,403
Preferred Stock Of Government Sponsored Entities Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 13,444 | 11,403
Preferred Stock Of Government Sponsored Entities Member |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 13,444 | 11,403
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 560 |
Other Equity Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 560 |
Other Equity Securities [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value | 560 |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Total Assets | 28 | 30
Warrant [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 28 | 30
Option Contracts Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 3 |
Liabilities |  |
Total Liabilities | 2 |
Option Contracts Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 3 |
Liabilities |  |
Total Liabilities | 2 |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets | 5,093 | 6,182
Liabilities |  |
Total Liabilities | 3,322 | 6,140
Foreign Exchange Contract [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets | 5,093 | 6,182
Liabilities |  |
Total Liabilities | 3,322 | 6,140
Trust Preferred Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value |  | 123
Trust Preferred Securities [Member] | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Available-for-sale Securities - Fair Value |  | 123
Trading Securities Member | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Total Assets |  | 4,936
Trading Securities Member | Estimate of Fair Value Measurement [Member] |  |
Securities available-for-sale |  |
Total Assets |  | $ 4,936

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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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