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Note 6 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | $ 2,044,312 | $ 1,290,676
Securities Available-for-sale, Gross Unrealized Gains |  | 26,943 | 14,954
Securities Available-for-sale, Gross Unrealized Losses | 15,500 | 52,950 | 14,150
Available-for-sale Securities - Fair Value |  | 2,018,305 | 1,291,480
Total investment securities - Amortized Cost |  | 2,044,312 | 2,064,444
Total investment securities - Gross Unrealized Gains |  | 26,943 | 65,092
Total investment securities - Gross Unrealized Losses |  | 52,950 | 14,150
Total investment securities - Fair Value |  | 2,018,305 | 2,115,386
Securities Held-to-Maturity, Amortized Cost |  |  | 773,768
Securities Held-to-Maturity, Gross Unrealized Gains |  |  | 50,138
Securities Held-to-Maturity, Gross Unrealized Losses |  |  | 0
Securities Held-to-Maturity, Fair Value |  |  | 823,906
US Treasury Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 409,849 | 509,748
Securities Available-for-sale, Gross Unrealized Gains |  | 192 | 228
Securities Available-for-sale, Gross Unrealized Losses |  | 6 | 5
Available-for-sale Securities - Fair Value |  | 410,035 | 509,971
Collateralized Mortgage Backed Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 1,430,373 | 404,505
Securities Available-for-sale, Gross Unrealized Gains |  | 20,153 | 12,194
Securities Available-for-sale, Gross Unrealized Losses |  | 45,178 | 5
Available-for-sale Securities - Fair Value |  | 1,405,348 | 416,694
Securities Held-to-Maturity, Amortized Cost |  |  | 634,757
Securities Held-to-Maturity, Gross Unrealized Gains |  |  | 40,801
Securities Held-to-Maturity, Gross Unrealized Losses |  |  | 0
Securities Held-to-Maturity, Fair Value |  |  | 675,558
Collateralized Mortgage Obligations [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 7,438 | 9,772
Securities Available-for-sale, Gross Unrealized Gains |  | 295 | 430
Securities Available-for-sale, Gross Unrealized Losses |  | 65 | 34
Available-for-sale Securities - Fair Value |  | 7,668 | 10,168
Asset-backed Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 132 | 145
Securities Available-for-sale, Gross Unrealized Gains |  | 1 | 0
Securities Available-for-sale, Gross Unrealized Losses |  | 0 | 4
Available-for-sale Securities - Fair Value |  | 133 | 141
Corporate Debt Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 189,951 | 349,973
Securities Available-for-sale, Gross Unrealized Gains |  | 415 | 106
Securities Available-for-sale, Gross Unrealized Losses |  | 7,540 | 14,102
Available-for-sale Securities - Fair Value |  | 182,826 | 335,977
Securities Held-to-Maturity, Amortized Cost |  |  | 9,974
Securities Held-to-Maturity, Gross Unrealized Gains |  |  | 69
Securities Held-to-Maturity, Gross Unrealized Losses |  |  | 0
Securities Held-to-Maturity, Fair Value |  |  | 10,043
Mutual Funds Member |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 6,000 | 6,000
Securities Available-for-sale, Gross Unrealized Gains |  | 0 | 79
Securities Available-for-sale, Gross Unrealized Losses |  | 161 | 0
Available-for-sale Securities - Fair Value |  | 5,839 | 6,079
Preferred Stock Of Government Sponsored Entities Member |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  | 569 | 569
Securities Available-for-sale, Gross Unrealized Gains |  | 5,887 | 1,766
Securities Available-for-sale, Gross Unrealized Losses |  | 0 | 0
Available-for-sale Securities - Fair Value |  | 6,456 | 2,335
State and Municipal Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Held-to-Maturity, Amortized Cost |  |  | 129,037
Securities Held-to-Maturity, Gross Unrealized Gains |  |  | 9,268
Securities Held-to-Maturity, Gross Unrealized Losses |  |  | 0
Securities Held-to-Maturity, Fair Value |  |  | 138,305
Trust Preferred Securities [Member] |  |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |  |
Securities Available-for-sale, Amortized Cost |  |  | 9,964
Securities Available-for-sale, Gross Unrealized Gains |  |  | 151
Securities Available-for-sale, Gross Unrealized Losses |  |  | 0
Available-for-sale Securities - Fair Value |  |  | $ 10,115

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