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Note 6 - Investment Securities (Detail) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Securities Available-for-Sale |  |
Investment Securities - Less than 12 Months - Fair Value | $ 333,446 | $ 102,668
Investment Securities - Less than 12 Months - Unrealized Losses | 1,709 | 2,538
Investment Securities - 12 Months or longer - Fair Value | 196,804 | 254,276
Investment Securities- 12 Months or longer - Unrealized Losses | 9,064 | 11,612
Investment Securities - Fair Value | 530,250 | 356,944
Investment Securities - Unrealized Losses | 10,773 | 14,150
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 321,604 | 231
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 1,551 | 1
Securities Available-for-Sale - 12 Months or longer - Fair Value | 163 | 170
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 1
Securities Available-for-Sale - Fair Value | 321,767 | 401
Securities Available-for-Sale - Unrealized Losses | 1,552 | 2
Mortgage Backed Securities Non Agency Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 0 | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 96 | 96
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 2
Securities Available-for-Sale - Fair Value | 96 | 96
Securities Available-for-Sale - Unrealized Losses | 1 | 2
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 0 | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 417 | 439
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 54 | 35
Securities Available-for-Sale - Fair Value | 417 | 439
Securities Available-for-Sale - Unrealized Losses | 54 | 35
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 0 | 0
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 132 | 141
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 4 | 4
Securities Available-for-Sale - Fair Value | 132 | 141
Securities Available-for-Sale - Unrealized Losses | 4 | 4
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 9,855 | 52,468
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 145 | 2,532
Securities Available-for-Sale - 12 Months or longer - Fair Value | 195,996 | 253,430
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 9,004 | 11,570
Securities Available-for-Sale - Fair Value | 205,851 | 305,898
Securities Available-for-Sale - Unrealized Losses | 9,149 | 14,102
Mutual Funds Member |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 1,987 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 13 |
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 | 1,987 |
Securities Available-for-Sale - Unrealized Losses | 13 |
Total [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 333,446 | 102,668
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 1,709 | 2,538
Securities Available-for-Sale - 12 Months or longer - Fair Value | 196,804 | 254,276
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 9,064 | 11,612
Securities Available-for-Sale - Fair Value | 530,250 | 356,944
Securities Available-for-Sale - Unrealized Losses | 10,773 | 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
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 49,969
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 5
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 |  | 49,969
Securities Available-for-Sale - Unrealized Losses |  | $ 5

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