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Note 4 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | $ 1,637,965 | $ 1,290,676
Securities Available-for-sale, Gross Unrealized Gains | 18,511 | 14,954
Securities Available-for-sale, Gross Unrealized Losses | 69,808 | 14,150
Securities Available-for-sale, Fair Value | 1,586,668 | 1,291,480
Total investment securities - Amortized Cost | 1,637,695 | 2,064,444
Total investment securities - Gross Unrealized Gains | 18,511 | 65,092
Total investment securities - Gross Unrealized Losses | 69,808 | 14,150
Total investment securities - Fair Value | 1,586,668 | 2,115,386
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost |  | 773,768
Securities Held-to-Maturity, Gross Unrealized Gains |  | 50,138
Securities Held-to-Maturity, Fair Value |  | 823,906
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 460,095 | 509,748
Securities Available-for-sale, Gross Unrealized Gains | 99 | 228
Securities Available-for-sale, Gross Unrealized Losses | 1 | 5
Securities Available-for-sale, Fair Value | 460,193 | 509,971
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 1,010,294 | 404,505
Securities Available-for-sale, Gross Unrealized Gains | 7,049 | 12,194
Securities Available-for-sale, Gross Unrealized Losses | 64,529 | 5
Securities Available-for-sale, Fair Value | 952,814 | 416,694
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost |  | 634,757
Securities Held-to-Maturity, Gross Unrealized Gains |  | 40,801
Securities Held-to-Maturity, Fair Value |  | 675,558
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 5,929 | 9,772
Securities Available-for-sale, Gross Unrealized Gains | 231 | 430
Securities Available-for-sale, Gross Unrealized Losses | 54 | 34
Securities Available-for-sale, Fair Value | 6,106 | 10,168
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 123 | 145
Securities Available-for-sale, Gross Unrealized Losses |  | 4
Securities Available-for-sale, Fair Value | 123 | 141
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 154,955 | 349,973
Securities Available-for-sale, Gross Unrealized Gains | 298 | 106
Securities Available-for-sale, Gross Unrealized Losses | 4,949 | 14,102
Securities Available-for-sale, Fair Value | 150,304 | 335,977
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost |  | 9,974
Securities Held-to-Maturity, Gross Unrealized Gains |  | 69
Securities Held-to-Maturity, Fair Value |  | 10,043
Mutual Funds Member |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 6,000 | 6,000
Securities Available-for-sale, Gross Unrealized Gains |  | 79
Securities Available-for-sale, Gross Unrealized Losses | 275 |
Securities Available-for-sale, Fair Value | 5,725 | 6,079
Preferred Stock Of Government Sponsored Entities Member |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 569 | 569
Securities Available-for-sale, Gross Unrealized Gains | 10,834 | 1,766
Securities Available-for-sale, Fair Value | 11,403 | 2,335
State and Municipal Securities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost |  | 129,037
Securities Held-to-Maturity, Gross Unrealized Gains |  | 9,268
Securities Held-to-Maturity, Fair Value |  | 138,305
Trust Preferred Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 9,964
Securities Available-for-sale, Gross Unrealized Gains |  | 151
Securities Available-for-sale, Fair Value |  | $ 10,115

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