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Note 16 - Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2015 |  | 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 |  | $ | 284,288 |  |  | $ | - |  |  | $ | - |  |  | $ | 284,288 |
U.S. government sponsored entities |  |  | - |  |  |  | 148,160 |  |  |  | - |  |  |  | 148,160 |
Mortgage-backed securities |  |  | - |  |  |  | 1,062,269 |  |  |  | - |  |  |  | 1,062,269 |
Collateralized mortgage obligations |  |  | - |  |  |  | 36 |  |  |  | - |  |  |  | 36 |
Corporate debt securities |  |  | - |  |  |  | 73,855 |  |  |  | - |  |  |  | 73,855 |
Mutual funds |  |  | 5,833 |  |  |  | - |  |  |  | - |  |  |  | 5,833 |
Preferred stock of government sponsored entities |  |  | - |  |  |  | 3,216 |  |  |  | - |  |  |  | 3,216 |
Other equity securities |  |  | - |  |  |  | 8,695 |  |  |  | - |  |  |  | 8,695 |
Total securities available-for-sale |  |  | 290,121 |  |  |  | 1,296,231 |  |  |  | - |  |  |  | 1,586,352 |
Warrants |  |  | - |  |  |  | - |  |  |  | 62 |  |  |  | 62 |
Foreign exchange contracts |  |  | - |  |  |  | 3,339 |  |  |  | - |  |  |  | 3,339 |
Total assets |  | $ | 290,121 |  |  | $ | 1,299,570 |  |  | $ | 62 |  |  | $ | 1,589,753 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option contracts |  | $ | - |  |  | $ | 28 |  |  | $ | - |  |  | $ | 28 |
Interest rate swaps |  |  | - |  |  |  | 6,496 |  |  |  | - |  |  |  | 6,496 |
Foreign exchange contracts |  |  | - |  |  |  | 4,124 |  |  |  | - |  |  |  | 4,124 |
Total liabilities |  | $ | - |  |  | $ | 10,648 |  |  | $ | - |  |  | $ | 10,648 |
As of December 31, 2014 |  | 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 |  | $ | 664,004 |  |  | $ | - |  |  | $ | - |  |  | $ | 664,004 |
Mortgage-backed securities |  |  | - |  |  |  | 544,303 |  |  |  | - |  |  |  | 544,303 |
Collateralized mortgage obligations |  |  | - |  |  |  | 45 |  |  |  | - |  |  |  | 45 |
Corporate debt securities |  |  | - |  |  |  | 94,472 |  |  |  | - |  |  |  | 94,472 |
Mutual funds |  |  | 5,866 |  |  |  | - |  |  |  | - |  |  |  | 5,866 |
Preferred stock of government sponsored entities |  |  | - |  |  |  | 3,224 |  |  |  | - |  |  |  | 3,224 |
Other equity securities |  |  | - |  |  |  | 7,021 |  |  |  | - |  |  |  | 7,021 |
Total securities available-for-sale |  |  | 669,870 |  |  |  | 649,065 |  |  |  | - |  |  |  | 1,318,935 |
Warrants |  |  | - |  |  |  | - |  |  |  | 27 |  |  |  | 27 |
Foreign exchange contracts |  |  | - |  |  |  | 1,876 |  |  |  | - |  |  |  | 1,876 |
Total assets |  | $ | 669,870 |  |  | $ | 650,941 |  |  | $ | 27 |  |  | $ | 1,320,838 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | - |  |  | $ | 4,626 |  |  | $ | - |  |  | $ | 4,626 |
Foreign exchange contracts |  |  | - |  |  |  | 5,007 |  |  |  | - |  |  |  | 5,007 |
Total liabilities |  | $ | - |  |  | $ | 9,633 |  |  | $ | - |  |  | $ | 9,633 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | As of December 31, 2015 |  |  | Total Losses/(Gains) |
|  | Fair Value Measurements Using |  |  | Total at |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | December 31, 2015 |  |  | December 31, 2014 |
|  | (In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | - |  |  | $ | - |  |  | $ | 6,317 |  |  | $ | 6,317 |  |  | $ | 806 |  |  | $ | 17 |
Commercial mortgage loans |  |  | - |  |  |  | - |  |  |  | 20,359 |  |  |  | 20,359 |  |  |  | 598 |  |  |  | 3,914 |
Residential mortgage and equity lines |  |  | - |  |  |  | - |  |  |  | 13,009 |  |  |  | 13,009 |  |  |  | 146 |  |  |  | 27 |
Total impaired loans |  |  | - |  |  |  | - |  |  |  | 39,685 |  |  |  | 39,685 |  |  |  | 1,550 |  |  |  | 3,958 |
Other real estate owned (1 |  |  | - |  |  |  | 10,047 |  |  |  | 4,235 |  |  |  | 14,282 |  |  |  | 404 |  |  |  | 202 |
Investments in venture capital and private company stock |  |  | - |  |  |  | - |  |  |  | 4,922 |  |  |  | 4,922 |  |  |  | 553 |  |  |  | 436 |
Total assets |  | $ | - |  |  | $ | 10,047 |  |  | $ | 48,842 |  |  | $ | 58,889 |  |  | $ | 2,507 |  |  | $ | 4,596 |
|  | As of December 31, 2014 |  |  | Total Losses/(Gains) |
|  | Fair Value Measurements Using |  |  | Total at |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | December 31, 2014 |  |  | December 31, 2013 |
|  | (In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | - |  |  | $ | - |  |  | $ | 3,774 |  |  | $ | 3,774 |  |  | $ | 17 |  |  | $ | 5,731 |
Commercial mortgage loans |  |  | - |  |  |  | - |  |  |  | 25,029 |  |  |  | 25,029 |  |  |  | 3,914 |  |  |  | 125 |
Construction- other |  |  | - |  |  |  | - |  |  |  | 7,625 |  |  |  | 7,625 |  |  |  | - |  |  |  | - |
Residential mortgage and equity lines |  |  | - |  |  |  | - |  |  |  | 13,126 |  |  |  | 13,126 |  |  |  | 27 |  |  |  | 213 |
Total impaired loans |  |  | - |  |  |  | - |  |  |  | 49,554 |  |  |  | 49,554 |  |  |  | 3,958 |  |  |  | 6,069 |
Other real estate owned (1) |  |  | - |  |  |  | 16,458 |  |  |  | 4,110 |  |  |  | 20,568 |  |  |  | 202 |  |  |  | (3,134 | )
Investments in venture capital and private company stock |  |  | - |  |  |  | - |  |  |  | 5,495 |  |  |  | 5,495 |  |  |  | 436 |  |  |  | 409 |
Equity investments |  |  | - |  |  |  | - |  |  |  | 617 |  |  |  | 617 |  |  |  | - |  |  |  | - |
Total assets |  | $ | - |  |  | $ | 16,458 |  |  | $ | 59,776 |  |  | $ | 76,234 |  |  | $ | 4,596 |  |  | $ | 3,344 |

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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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&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=36462937&loc=d3e19190-110258 + Details
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