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Note 6 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |
Securities Available-for-sale, Gross Unrealized Losses | $ 21,600 |
Available-for-sale Securities - Fair Value | 1,743,309 | 1,291,480
Total investment securities - Amortized Cost | 1,779,859 | 2,064,444
Total investment securities - Gross Unrealized Gains | 16,944 | 65,092
Total investment securities - Gross Unrealized Losses | 53,494 | 14,150
Total investment securities - Fair Value | 1,743,309 | 2,115,386
Securities Held-to-Maturity, Amortized Cost |  | 773,768
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 | 460,119 | 509,748
Securities Available-for-sale, Gross Unrealized Gains | 214 | 228
Securities Available-for-sale, Gross Unrealized Losses |  | 5
Available-for-sale Securities - Fair Value | 460,333 | 509,971
Collateralized Mortgage Backed Securities [Member] |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |
Securities Available-for-sale, Amortized Cost | 1,131,602 | 404,505
Securities Available-for-sale, Gross Unrealized Gains | 9,364 | 12,194
Securities Available-for-sale, Gross Unrealized Losses | 45,947 | 5
Available-for-sale Securities - Fair Value | 1,095,019 | 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 | 6,489 | 9,772
Securities Available-for-sale, Gross Unrealized Gains | 268 | 430
Securities Available-for-sale, Gross Unrealized Losses | 60 | 34
Available-for-sale Securities - Fair Value | 6,697 | 10,168
Asset-backed Securities [Member] |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |
Securities Available-for-sale, Amortized Cost | 127 | 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 | 128 | 141
Corporate Debt Securities [Member] |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |
Securities Available-for-sale, Amortized Cost | 174,953 | 349,973
Securities Available-for-sale, Gross Unrealized Gains | 186 | 106
Securities Available-for-sale, Gross Unrealized Losses | 7,299 | 14,102
Available-for-sale Securities - Fair Value | 167,840 | 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 | 188 | 0
Available-for-sale Securities - Fair Value | 5,812 | 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 | 6,911 | 1,766
Securities Available-for-sale, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities - Fair Value | 7,480 | 2,335
Total [Member] |  |
Note 6 - Investment Securities (Details) - Investment Securities [Line Items] |  |
Securities Available-for-sale, Amortized Cost | 1,779,859 | 1,290,676
Securities Available-for-sale, Gross Unrealized Gains | 16,944 | 14,954
Securities Available-for-sale, Gross Unrealized Losses | 53,494 | 14,150
Available-for-sale Securities - Fair Value | 1,743,309 | 1,291,480
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
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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