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Note 6 - Investment Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Securities Available-for-Sale |  |
Investment Securities - Less than 12 Months - Fair Value | $ 1,016,903 | $ 102,668
Investment Securities - Less than 12 Months - Unrealized Losses | 45,587 | 2,538
Investment Securities - 12 Months or longer - Fair Value | 153,194 | 254,276
Investment Securities- 12 Months or longer - Unrealized Losses | 7,363 | 11,612
Investment Securities - Fair Value | 1,170,097 | 356,944
Investment Securities - Unrealized Losses | 52,950 | 14,150
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 99,918 | 49,969
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 6 | 5
Securities Available-for-Sale - 12 Months or longer - Fair Value | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 0 | 0
Securities Available-for-Sale - Fair Value | 99,918 | 49,969
Securities Available-for-Sale - Unrealized Losses | 6 | 5
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 901,227 | 231
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 45,174 | 1
Securities Available-for-Sale - 12 Months or longer - Fair Value | 160 | 170
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 2 | 1
Securities Available-for-Sale - Fair Value | 901,387 | 401
Securities Available-for-Sale - Unrealized Losses | 45,176 | 2
Mortgage Backed Securities Non Agency Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 94 | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 0 | 96
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 0 | 2
Securities Available-for-Sale - Fair Value | 94 | 96
Securities Available-for-Sale - Unrealized Losses | 2 | 2
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 67 | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 332 | 439
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 63 | 35
Securities Available-for-Sale - Fair Value | 399 | 439
Securities Available-for-Sale - Unrealized Losses | 65 | 35
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 9,758 | 52,468
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 242 | 2,532
Securities Available-for-Sale - 12 Months or longer - Fair Value | 152,702 | 253,430
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 7,298 | 11,570
Securities Available-for-Sale - Fair Value | 162,460 | 305,898
Securities Available-for-Sale - Unrealized Losses | 7,540 | 14,102
Mutual Funds Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 5,839 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 161 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 0 |
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 0 |
Securities Available-for-Sale - Fair Value | 5,839 |
Securities Available-for-Sale - Unrealized Losses | 161 |
Total [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 1,016,903 | 102,668
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 45,587 | 2,538
Securities Available-for-Sale - 12 Months or longer - Fair Value | 153,194 | 254,276
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 7,363 | 11,612
Securities Available-for-Sale - Fair Value | 1,170,097 | 356,944
Securities Available-for-Sale - Unrealized Losses | 52,950 | 14,150
Securities Held-to-Maturity |  |
Total securities held-to-maturity |  | 0
Total securities held-to-maturity |  | 0
Total securities held-to-maturity |  | 0
Total securities held-to-maturity |  | 0
Total securities held-to-maturity |  | 0
Total securities held-to-maturity |  | 0
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 0
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 - Fair Value |  | 141
Securities Available-for-Sale - Unrealized Losses |  | $ 4

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