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Note 4 - Investment Securities (Details) - Temporarily Impaired Securities $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 1,410,387 | $ 376,601
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 14,253 | $ 3,998
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 47 | 8
Securities Available-for-Sale - 12 Months or longer - Fair Value | $ 49,400 | $ 494,754
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | $ 1,670 | $ 7,801
Securities Available-for-Sale - 12 Months or longer - No. of issuances | 7 | 22
Securities Available-for-Sale - Fair Value | $ 1,459,787 | $ 871,355
Securities Available-for-Sale - Unrealized Losses | $ 15,923 | $ 11,799
Securities Available-for-Sale - No. of issuances | 54 | 30
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 224,289 | $ 374,153
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 395 | $ 265
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 5 | 6
Securities Available-for-Sale - Fair Value | $ 224,289 | $ 374,153
Securities Available-for-Sale - Unrealized Losses | $ 395 | $ 265
Securities Available-for-Sale - No. of issuances | 5 | 6
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 148,160 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 1,840 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 3 |
Securities Available-for-Sale - Fair Value | $ 148,160 |
Securities Available-for-Sale - Unrealized Losses | $ 1,840 |
Securities Available-for-Sale - No. of issuances | 3 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 1,025,342 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 11,398 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 35 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | $ 6 | $ 425,090
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | $ 1 | $ 6,386
Securities Available-for-Sale - 12 Months or longer - No. of issuances | 2 | 16
Securities Available-for-Sale - Fair Value | $ 1,025,348 | $ 425,090
Securities Available-for-Sale - Unrealized Losses | $ 11,399 | $ 6,386
Securities Available-for-Sale - No. of issuances | 37 | 16
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | $ 36 | $ 45
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | $ 27 | $ 34
Securities Available-for-Sale - 12 Months or longer - No. of issuances | 1 | 1
Securities Available-for-Sale - Fair Value | $ 36 | $ 45
Securities Available-for-Sale - Unrealized Losses | $ 27 | $ 34
Securities Available-for-Sale - No. of issuances | 1 | 1
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 9,950 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 50 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 1 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | $ 43,525 | $ 63,753
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | $ 1,475 | $ 1,247
Securities Available-for-Sale - 12 Months or longer - No. of issuances | 3 | 4
Securities Available-for-Sale - Fair Value | $ 53,475 | $ 63,753
Securities Available-for-Sale - Unrealized Losses | $ 1,525 | $ 1,247
Securities Available-for-Sale - No. of issuances | 4 | 4
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | $ 5,833 | $ 5,866
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | $ 167 | $ 134
Securities Available-for-Sale - 12 Months or longer - No. of issuances | 1 | 1
Securities Available-for-Sale - Fair Value | $ 5,833 | $ 5,866
Securities Available-for-Sale - Unrealized Losses | $ 167 | $ 134
Securities Available-for-Sale - No. of issuances | 1 | 1
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 2,488 | $ 2,448
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 228 | $ 3,733
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 2 | 2
Securities Available-for-Sale - Fair Value | $ 2,488 | $ 2,448
Securities Available-for-Sale - Unrealized Losses | $ 228 | $ 3,733
Securities Available-for-Sale - No. of issuances | 2 | 2
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 158 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | $ 342 |
Securities Available-for-Sale - Less than 12 Months - No. of Issuances | 1 |
Securities Available-for-Sale - Fair Value | $ 158 |
Securities Available-for-Sale - Unrealized Losses | $ 342 |
Securities Available-for-Sale - No. of issuances | 1 |

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