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Note 6 - Investment Securities (Detail) - Investment Securities (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | $ 2,149,786 | $ 1,290,676
Securities Available-for-sale, Gross Unrealized Gains | 51,283 | 14,954
Securities Available-for-sale, Gross Unrealized Losses | 10,773 | 14,150
Securities Available-for-sale, Fair Value | 2,190,296 | 1,291,480
Total investment securities - Amortized Cost | 2,149,786 | 2,064,444
Total investment securities - Gross Unrealized Gains | 51,283 | 65,092
Total investment securities - Gross Unrealized Losses | 10,773 | 14,150
Total investment securities - Fair Value | 2,190,296 | 2,115,386
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost | 773,768 | 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 | 823,906
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 359,880 | 509,748
Securities Available-for-sale, Gross Unrealized Gains | 234 | 228
Securities Available-for-sale, Gross Unrealized Losses | 0 | 5
Securities Available-for-sale, Fair Value | 360,114 | 509,971
State and Municipal Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 59,805 |
Securities Available-for-sale, Gross Unrealized Gains | 3,653 |
Securities Available-for-sale, Gross Unrealized Losses | 0 |
Securities Available-for-sale, Fair Value | 63,458 |
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, Gross Unrealized Losses | 0 |
Securities Held-to-Maturity, Fair Value | 138,305 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 1,449,816 | 404,505
Securities Available-for-sale, Gross Unrealized Gains | 42,335 | 12,194
Securities Available-for-sale, Gross Unrealized Losses | 1,553 | 5
Securities Available-for-sale, Fair Value | 1,490,598 | 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, Gross Unrealized Losses | 0 |
Securities Held-to-Maturity, Fair Value | 675,558 |
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 8,631 | 9,772
Securities Available-for-sale, Gross Unrealized Gains | 369 | 430
Securities Available-for-sale, Gross Unrealized Losses | 54 | 34
Securities Available-for-sale, Fair Value | 8,946 | 10,168
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 136 | 145
Securities Available-for-sale, Gross Unrealized Gains | 0 | 0
Securities Available-for-sale, Gross Unrealized Losses | 4 | 4
Securities Available-for-sale, Fair Value | 132 | 141
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 264,949 | 349,973
Securities Available-for-sale, Gross Unrealized Gains | 657 | 106
Securities Available-for-sale, Gross Unrealized Losses | 9,149 | 14,102
Securities Available-for-sale, Fair Value | 256,457 | 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, Gross Unrealized Losses | 0 |
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 | 48 | 79
Securities Available-for-sale, Gross Unrealized Losses | 13 | 0
Securities Available-for-sale, Fair Value | 6,035 | 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 | 3,987 | 1,766
Securities Available-for-sale, Gross Unrealized Losses | 0 | 0
Securities Available-for-sale, Fair Value | 4,556 | 2,335
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, Gross Unrealized Losses |  | 0
Securities Available-for-sale, Fair Value |  | $ 10,115

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 5 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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