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Note 4 - Investment Securities (Detail) - Investment Securities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost | $ 773,768 | $ 1,153,504
Securities Held-to-Maturity, Gross Unrealized Gains | 50,138 | 50,810
Securities Held-to-Maturity, Gross Unrealized Losses | 0 | 337
Securities Held-to-Maturity, Fair Value | 823,906 | 1,203,977
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 1,290,676 | 1,309,521
Securities Available-for-sale, Gross Unrealized Gains | 14,954 | 17,410
Securities Available-for-sale, Gross Unrealized Losses | 14,150 | 32,453
Securities Available-for-sale, Fair Value | 1,291,480 | 1,294,478
Total investment securities - Amortized Cost | 2,064,444 | 2,463,025
Total investment securities - Gross Unrealized Gains | 65,092 | 68,220
Total investment securities - Gross Unrealized Losses | 14,150 | 32,790
Total investment securities - Fair Value | 2,115,386 | 2,498,455
State and Municipal Securities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost | 129,037 | 129,577
Securities Held-to-Maturity, Gross Unrealized Gains | 9,268 | 7,053
Securities Held-to-Maturity, Gross Unrealized Losses | 0 | 0
Securities Held-to-Maturity, Fair Value | 138,305 | 136,630
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 1,869
Securities Available-for-sale, Gross Unrealized Gains |  | 59
Securities Available-for-sale, Gross Unrealized Losses |  | 0
Securities Available-for-sale, Fair Value |  | 1,928
Collateralized Mortgage Backed Securities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost | 634,757 | 913,990
Securities Held-to-Maturity, Gross Unrealized Gains | 40,801 | 42,351
Securities Held-to-Maturity, Gross Unrealized Losses | 0 | 0
Securities Held-to-Maturity, Fair Value | 675,558 | 956,341
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 404,505 | 325,706
Securities Available-for-sale, Gross Unrealized Gains | 12,194 | 12,361
Securities Available-for-sale, Gross Unrealized Losses | 5 | 436
Securities Available-for-sale, Fair Value | 416,694 | 337,631
Corporate Debt Securities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost | 9,974 | 9,971
Securities Held-to-Maturity, Gross Unrealized Gains | 69 | 0
Securities Held-to-Maturity, Gross Unrealized Losses | 0 | 337
Securities Held-to-Maturity, Fair Value | 10,043 | 9,634
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 349,973 | 412,045
Securities Available-for-sale, Gross Unrealized Gains | 106 | 113
Securities Available-for-sale, Gross Unrealized Losses | 14,102 | 31,729
Securities Available-for-sale, Fair Value | 335,977 | 380,429
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 509,748 |
Securities Available-for-sale, Gross Unrealized Gains | 228 |
Securities Available-for-sale, Gross Unrealized Losses | 5 |
Securities Available-for-sale, Fair Value | 509,971 |
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 9,772 | 16,184
Securities Available-for-sale, Gross Unrealized Gains | 430 | 540
Securities Available-for-sale, Gross Unrealized Losses | 34 | 238
Securities Available-for-sale, Fair Value | 10,168 | 16,486
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 145 | 172
Securities Available-for-sale, Gross Unrealized Gains | 0 | 0
Securities Available-for-sale, Gross Unrealized Losses | 4 | 6
Securities Available-for-sale, Fair Value | 141 | 166
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 | 48
Securities Available-for-sale, Gross Unrealized Losses | 0 | 13
Securities Available-for-sale, Fair Value | 6,079 | 6,035
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 | 1,766 | 1,085
Securities Available-for-sale, Gross Unrealized Losses | 0 | 0
Securities Available-for-sale, Fair Value | 2,335 | 1,654
Trust Preferred Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 9,964 | 45,501
Securities Available-for-sale, Gross Unrealized Gains | 151 | 486
Securities Available-for-sale, Gross Unrealized Losses | 0 | 24
Securities Available-for-sale, Fair Value | 10,115 | 45,963
U.S. Government Sponsored Entities [Member] |  |
Securities Held-to-Maturity |  |
Securities Held-to-Maturity, Amortized Cost |  | 99,966
Securities Held-to-Maturity, Gross Unrealized Gains |  | 1,406
Securities Held-to-Maturity, Gross Unrealized Losses |  | 0
Securities Held-to-Maturity, Fair Value |  | 101,372
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 500,007
Securities Available-for-sale, Gross Unrealized Gains |  | 1,226
Securities Available-for-sale, Gross Unrealized Losses |  | 7
Securities Available-for-sale, Fair Value |  | 501,226
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 1,468
Securities Available-for-sale, Gross Unrealized Gains |  | 1,492
Securities Available-for-sale, Gross Unrealized Losses |  | 0
Securities Available-for-sale, Fair Value |  | $ 2,960

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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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