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Note 4 - Investment Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 30 |
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 19 |
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 75,064 | $ 49,969
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 1 | 5
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 1 | 1
Securities Available-for-Sale - Fair Value | 75,064 | 49,969
Securities Available-for-Sale - Unrealized Losses | 1 | 5
Securities Available-for-Sale - No. of Issuances | 1 | 1
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 792,012 | 231
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 64,526 | 1
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 25 | 2
Securities Available-for-Sale - 12 Months or longer - Fair Value | 272 | 170
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 2 | 1
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 7 | 6
Securities Available-for-Sale - Fair Value | 792,284 | 401
Securities Available-for-Sale - Unrealized Losses | 64,528 | 2
Securities Available-for-Sale - No. of Issuances | 32 | 8
Mortgage Backed Securities Non Agency Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 94 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 1 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 1 |
Securities Available-for-Sale - 12 Months or longer - Fair Value |  | 96
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses |  | 2
Securities Available-for-Sale - 12 Months or longer - No. of Issuances |  | 1
Securities Available-for-Sale - Fair Value | 94 | 96
Securities Available-for-Sale - Unrealized Losses | 1 | 2
Securities Available-for-Sale - No. of Issuances | 1 | 1
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 68 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 4 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 2 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 301 | 439
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 50 | 35
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 3 | 4
Securities Available-for-Sale - Fair Value | 369 | 439
Securities Available-for-Sale - Unrealized Losses | 54 | 35
Securities Available-for-Sale - No. of Issuances | 5 | 4
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 9,970 | 52,468
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 30 | 2,532
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 1 | 4
Securities Available-for-Sale - 12 Months or longer - Fair Value | 100,081 | 253,430
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 4,919 | 11,570
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 8 | 22
Securities Available-for-Sale - Fair Value | 110,051 | 305,898
Securities Available-for-Sale - Unrealized Losses | 4,949 | 14,102
Securities Available-for-Sale - No. of Issuances | 9 | 26
Mutual Funds Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 5,724 |
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 275 |
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 1 |
Securities Available-for-Sale - Fair Value | 5,724 |
Securities Available-for-Sale - Unrealized Losses | 275 |
Securities Available-for-Sale - No. of Issuances | 1 |
Total [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 877,208 | 102,668
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 64,562 | 2,538
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 30 | 7
Securities Available-for-Sale - 12 Months or longer - Fair Value | 106,378 | 254,276
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 5,246 | 11,612
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 19 | 34
Securities Available-for-Sale - Fair Value | 983,586 | 356,944
Securities Available-for-Sale - Unrealized Losses | 69,808 | 14,150
Securities Available-for-Sale - No. of Issuances | 49 | 41
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value |  | 141
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses |  | 4
Securities Available-for-Sale - 12 Months or longer - No. of Issuances |  | 1
Securities Available-for-Sale - Fair Value |  | 141
Securities Available-for-Sale - Unrealized Losses |  | $ 4
Securities Available-for-Sale - No. of Issuances |  | 1

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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