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Note 11 - Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
March 31, 2013 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
|  | (In thousands) |
Assets |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 360,114 |  |  | $ | - |  |  | $ | - |  |  | $ | 360,114 |
State and municipal securities |  |  | - |  |  |  | 63,458 |  |  |  | - |  |  |  | 63,458 |
Mortgage-backed securities |  |  | - |  |  |  | 1,490,598 |  |  |  | - |  |  |  | 1,490,598 |
Collateralized mortgage obligations |  |  | - |  |  |  | 8,946 |  |  |  | - |  |  |  | 8,946 |
Asset-backed securities |  |  | - |  |  |  | 132 |  |  |  | - |  |  |  | 132 |
Corporate debt securities |  |  | - |  |  |  | 256,457 |  |  |  | - |  |  |  | 256,457 |
Mutual funds |  |  | 6,035 |  |  |  | - |  |  |  | - |  |  |  | 6,035 |
Preferred stock of government sponsored entities |  |  | - |  |  |  | 4,556 |  |  |  | - |  |  |  | 4,556 |
Total securities available-for-sale |  |  | 366,149 |  |  |  | 1,824,147 |  |  |  | - |  |  |  | 2,190,296 |
Trading securities |  |  | - |  |  |  | 4,758 |  |  |  | - |  |  |  | 4,758 |
Warrants |  |  | - |  |  |  | - |  |  |  | 98 |  |  |  | 98 |
Option contracts |  |  | - |  |  |  | 8 |  |  |  | - |  |  |  | 8 |
Foreign exchange contracts |  |  | - |  |  |  | 2,987 |  |  |  | - |  |  |  | 2,987 |
Total assets |  | $ | 366,149 |  |  | $ | 1,831,900 |  |  | $ | 98 |  |  | $ | 2,198,147 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option contracts |  | $ | - |  |  | $ | 2 |  |  | $ | - |  |  | $ | 2 |
Foreign exchange contracts |  |  | - |  |  |  | 1,850 |  |  |  | - |  |  |  | 1,850 |
Total liabilities |  | $ | - |  |  | $ | 1,852 |  |  | $ | - |  |  | $ | 1,852 |
December 31, 2012 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
|  | (In thousands) |
Assets |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 509,971 |  |  | $ | - |  |  | $ | - |  |  | $ | 509,971 |
Mortgage-backed securities |  |  | - |  |  |  | 416,694 |  |  |  | - |  |  |  | 416,694 |
Collateralized mortgage obligations |  |  | - |  |  |  | 10,168 |  |  |  | - |  |  |  | 10,168 |
Asset-backed securities |  |  | - |  |  |  | 141 |  |  |  | - |  |  |  | 141 |
Corporate debt securities |  |  | - |  |  |  | 335,977 |  |  |  | - |  |  |  | 335,977 |
Mutual funds |  |  | 6,079 |  |  |  | - |  |  |  | - |  |  |  | 6,079 |
Preferred stock of government sponsored entities |  |  | - |  |  |  | 2,335 |  |  |  | - |  |  |  | 2,335 |
Trust preferred securities |  |  | 10,115 |  |  |  | - |  |  |  | - |  |  |  | 10,115 |
Other equity securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total securities available-for-sale |  |  | 526,165 |  |  |  | 765,315 |  |  |  | - |  |  |  | 1,291,480 |
Trading securities |  |  | - |  |  |  | 4,703 |  |  |  | - |  |  |  | 4,703 |
Warrants |  |  | - |  |  |  | - |  |  |  | 104 |  |  |  | 104 |
Option contracts |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Foreign exchange contracts |  |  | - |  |  |  | 2,924 |  |  |  | - |  |  |  | 2,924 |
Total assets |  | $ | 526,165 |  |  | $ | 772,942 |  |  | $ | 104 |  |  | $ | 1,299,211 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option contracts |  | $ | - |  |  | $ | 2 |  |  | $ | - |  |  | $ | 2 |
Foreign exchange contracts |  |  | - |  |  |  | 1,586 |  |  |  | - |  |  |  | 1,586 |
Total liabilities |  | $ | - |  |  | $ | 1,588 |  |  | $ | - |  |  | $ | 1,588 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | March 31, 2013 |  |  | Total Losses/(gains) |
|  | Fair Value Measurements Using |  |  | Total at |  |  | Three months ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | March 31, 2013 |  |  | March 31, 2012 |
|  | (In thousands) |
Assets |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | - |  |  | $ | - |  |  | $ | 5,463 |  |  | $ | 5,463 |  |  | $ | 463 |  |  | $ | 859 |
Commercial mortgage loans |  |  | - |  |  |  | - |  |  |  | 23,736 |  |  |  | 23,736 |  |  |  | 41 |  |  |  | - |
Construction- residential |  |  | - |  |  |  | - |  |  |  | 500 |  |  |  | 500 |  |  |  | - |  |  |  | - |
Construction- other |  |  | - |  |  |  | - |  |  |  | 46,162 |  |  |  | 46,162 |  |  |  | - |  |  |  | - |
Real estate loans |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,357 |
Residential mortgage and equity lines |  |  | - |  |  |  | - |  |  |  | 13,299 |  |  |  | 13,299 |  |  |  | 189 |  |  |  | 526 |
Land loans |  |  | - |  |  |  | - |  |  |  | 208 |  |  |  | 208 |  |  |  | 48 |  |  |  | - |
Total impaired loans |  |  | - |  |  |  | - |  |  |  | 89,368 |  |  |  | 89,368 |  |  |  | 741 |  |  |  | 2,742 |
Other real estate owned (1) |  |  | - |  |  |  | 24,892 |  |  |  | 4,515 |  |  |  | 29,407 |  |  |  | (66 | ) |  |  | 2,824 |
Investments in venture capital |  |  | - |  |  |  | - |  |  |  | 9,026 |  |  |  | 9,026 |  |  |  | 92 |  |  |  | 137 |
Equity investments |  |  | 142 |  |  |  | - |  |  |  | - |  |  |  | 142 |  |  |  | - |  |  |  | - |
Total assets |  | $ | 142 |  |  | $ | 24,892 |  |  | $ | 102,909 |  |  | $ | 127,943 |  |  | $ | 767 |  |  | $ | 5,703 |
|  | December 31, 2012 |  | Total Losses |
|  | Fair Value Measurements Using |  |  | Total at |  | Twelve months ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  | December 31, 2012 |  | December 31, 2011 |
|  | (In thousands) |
Assets |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | - |  |  | $ | - |  |  | $ | 3,492 |  |  | $ | 3,492 |  | $ | - |  | $ | 877 |
Commercial mortgage loans |  |  | - |  |  |  | - |  |  |  | 11,295 |  |  |  | 11,295 |  |  | 440 |  |  | - |
Construction- residential |  |  | - |  |  |  | - |  |  |  | 500 |  |  |  | 500 |  |  | - |  |  | - |
Construction- other |  |  | - |  |  |  | - |  |  |  | 46,153 |  |  |  | 46,153 |  |  | 65 |  |  | - |
Residential mortgage and equity lines |  |  | - |  |  |  | - |  |  |  | 11,206 |  |  |  | 11,206 |  |  | 605 |  |  | 820 |
Land loans |  |  | - |  |  |  | - |  |  |  | 297 |  |  |  | 297 |  |  | 162 |  |  | 46 |
Total impaired loans |  |  | - |  |  |  | - |  |  |  | 72,943 |  |  |  | 72,943 |  |  | 1,272 |  |  | 1,743 |
Other real estate owned (1) |  |  | - |  |  |  | 27,149 |  |  |  | 4,841 |  |  |  | 31,990 |  |  | 10,904 |  |  | 7,003 |
Investments in venture capital |  |  | - |  |  |  | - |  |  |  | 9,001 |  |  |  | 9,001 |  |  | 309 |  |  | 379 |
Equity investments |  |  | 142 |  |  |  | - |  |  |  | - |  |  |  | 142 |  |  | 181 |  |  | 200 |
Total assets |  | $ | 142 |  |  | $ | 27,149 |  |  | $ | 86,785 |  |  | $ | 114,076 |  | $ | 12,666 |  | $ | 9,325 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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