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Note 4 - Investment Securities (Detail) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Securities Available-for-Sale |  |
Investment Securities - Less than 12 Months - Fair Value | $ 102,668 | $ 253,430
Investment Securities - Less than 12 Months - Unrealized Losses | 2,538 | 14,586
Investment Securities - Less than 12 Months - No of Issuances | 7 | 30
Investment Securities - 12 Months or longer - Fair Value | 254,276 | 180,347
Investment Securities- 12 Months or longer - Unrealized Losses | 11,612 | 18,204
Investment Securities - 12 Months or longer - No. of Issuances | 34 | 28
Investment Securities - Fair Value | 356,944 | 433,777
Investment Securities - Unrealized Losses | 14,150 | 32,790
Investment Securities - No. of Issuances | 41 | 58
Total [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-maturity - Less than 12 Months - Fair Value | 0 | 9,635
Securities Held-to-maturity - Less than 12 Months - Unrealized Losses | 0 | 337
Securities Held-to-maturity - Less than 12 Months - No. of Issuances | 0 | 1
Securities Held-to-maturity - 12 Months or longer - Fair Value | 0 | 0
Securities Held-to-maturity - 12 Months or longer - Unrealized Losses | 0 | 0
Securities Held-to-maturity - 12 Months or longer - No. of Issuances | 0 | 0
Securities Held-to-maturity - Fair Value | 0 | 9,635
Securities Held-to-maturity - Unrealized Losses | 0 | 337
Securities Held-to-maturity - No. of Issuances | 0 | 1
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 102,668 | 243,795
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2,538 | 14,249
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 7 | 29
Securities Available-for-Sale - 12 Months or longer - Fair Value | 254,276 | 180,347
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 11,612 | 18,204
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 34 | 28
Securities Available-for-Sale - Fair Value | 356,944 | 424,142
Securities Available-for-Sale - Unrealized Losses | 14,150 | 32,453
Securities Available-for-Sale - No. of Issuances | 41 | 57
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 - Less than 12 Months - No. of Issuances | 1 |
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 - 12 Months or longer - No. of Issuances | 0 |
Securities Available-for-Sale - Fair Value | 49,969 |
Securities Available-for-Sale - Unrealized Losses | 5 |
Securities Available-for-Sale - No. of Issuances | 1 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 231 | 564
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 1 | 4
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 2 | 8
Securities Available-for-Sale - 12 Months or longer - Fair Value | 170 | 35
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 1
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 6 | 2
Securities Available-for-Sale - Fair Value | 401 | 599
Securities Available-for-Sale - Unrealized Losses | 2 | 5
Securities Available-for-Sale - No. of Issuances | 8 | 10
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 - Less than 12 Months - No. of Issuances | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 96 | 6,719
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 2 | 431
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 1 | 2
Securities Available-for-Sale - Fair Value | 96 | 6,719
Securities Available-for-Sale - Unrealized Losses | 2 | 431
Securities Available-for-Sale - No. of Issuances | 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 - Less than 12 Months - No. of Issuances | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 439 | 570
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 35 | 238
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 4 | 4
Securities Available-for-Sale - Fair Value | 439 | 570
Securities Available-for-Sale - Unrealized Losses | 35 | 238
Securities Available-for-Sale - No. of Issuances | 4 | 4
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 - Less than 12 Months - No. of Issuances | 0 | 0
Securities Available-for-Sale - 12 Months or longer - Fair Value | 141 | 166
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 4 | 6
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 1 | 1
Securities Available-for-Sale - Fair Value | 141 | 166
Securities Available-for-Sale - Unrealized Losses | 4 | 6
Securities Available-for-Sale - No. of Issuances | 1 | 1
Corporate Debt Securities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-maturity - Less than 12 Months - Fair Value |  | 9,635
Securities Held-to-maturity - Less than 12 Months - Unrealized Losses |  | 337
Securities Held-to-maturity - Less than 12 Months - No. of Issuances |  | 1
Securities Held-to-maturity - 12 Months or longer - Fair Value |  | 0
Securities Held-to-maturity - 12 Months or longer - Unrealized Losses |  | 0
Securities Held-to-maturity - 12 Months or longer - No. of Issuances |  | 0
Securities Held-to-maturity - Fair Value |  | 9,635
Securities Held-to-maturity - Unrealized Losses |  | 337
Securities Held-to-maturity - No. of Issuances |  | 1
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 52,468 | 185,577
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2,532 | 14,201
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 4 | 17
Securities Available-for-Sale - 12 Months or longer - Fair Value | 253,430 | 172,857
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 11,570 | 17,528
Securities Available-for-Sale - 12 Months or longer - No. of Issuances | 22 | 19
Securities Available-for-Sale - Fair Value | 305,898 | 358,434
Securities Available-for-Sale - Unrealized Losses | 14,102 | 31,729
Securities Available-for-Sale - No. of Issuances | 26 | 36
U.S. Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 49,993
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 7
Securities Available-for-Sale - Less than 12 Months - No. of Issuances |  | 1
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 - 12 Months or longer - No. of Issuances |  | 0
Securities Available-for-Sale - Fair Value |  | 49,993
Securities Available-for-Sale - Unrealized Losses |  | 7
Securities Available-for-Sale - No. of Issuances |  | 1
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 - Less than 12 Months - No. of Issuances |  | 1
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 - 12 Months or longer - No. of Issuances |  | 0
Securities Available-for-Sale - Fair Value |  | 1,987
Securities Available-for-Sale - Unrealized Losses |  | 13
Securities Available-for-Sale - No. of Issuances |  | 1
Trust Preferred Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 5,674
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 24
Securities Available-for-Sale - Less than 12 Months - No. of Issuances |  | 2
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 - 12 Months or longer - No. of Issuances |  | 0
Securities Available-for-Sale - Fair Value |  | 5,674
Securities Available-for-Sale - Unrealized Losses |  | $ 24
Securities Available-for-Sale - No. of Issuances |  | 2

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