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Note 12 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 155,525 |  |  | $ | 155,525 |  |  | $ | 144,909 |  |  | $ | 144,909 |
Short-term investments |  |  | 215,794 |  |  |  | 215,794 |  |  |  | 411,983 |  |  |  | 411,983 |
Securities held-to-maturity |  |  | - |  |  |  | - |  |  |  | 773,768 |  |  |  | 823,906 |
Securities available-for-sale |  |  | 2,190,296 |  |  |  | 2,190,296 |  |  |  | 1,291,480 |  |  |  | 1,291,480 |
Trading securities |  |  | 4,758 |  |  |  | 4,758 |  |  |  | 4,703 |  |  |  | 4,703 |
Loans, net |  |  | 7,175,462 |  |  |  | 7,119,348 |  |  |  | 7,235,587 |  |  |  | 7,169,732 |
Investment in Federal Home Loan Bank stock |  |  | 37,130 |  |  |  | 37,130 |  |  |  | 41,272 |  |  |  | 41,272 |
Warrants |  |  | 98 |  |  |  | 98 |  |  |  | 104 |  |  |  | 104 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Option contracts |  | $ | 1,113 |  |  | $ | 8 |  |  | $ | 105 |  |  | $ | - |
Foreign exchange contracts |  |  | 211,674 |  |  |  | 2,987 |  |  |  | 188,145 |  |  |  | 2,924 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Deposits |  | $ | 7,425,674 |  |  | $ | 7,431,517 |  |  | $ | 7,383,225 |  |  | $ | 7,389,015 |
Securities sold under agreements to repurchase |  |  | 1,150,000 |  |  |  | 1,244,735 |  |  |  | 1,250,000 |  |  |  | 1,361,585 |
Advances from Federal Home Loan Bank |  |  | 126,200 |  |  |  | 126,962 |  |  |  | 146,200 |  |  |  | 146,789 |
Other borrowings |  |  | 19,232 |  |  |  | 16,232 |  |  |  | 18,713 |  |  |  | 14,573 |
Long-term debt |  |  | 171,136 |  |  |  | 101,715 |  |  |  | 171,136 |  |  |  | 98,392 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Option contracts |  | $ | 465 |  |  | $ | 2 |  |  | $ | 104 |  |  | $ | 2 |
Foreign exchange contracts |  |  | 165,603 |  |  |  | 1,850 |  |  |  | 133,669 |  |  |  | 1,586 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 1,762,592 |  |  | $ | (1,867 | ) |  | $ | 1,740,463 |  |  | $ | (1,875 | )
Standby letters of credit |  |  | 45,814 |  |  |  | (173 | ) |  |  | 44,672 |  |  |  | (204 | )
Other letters of credit |  |  | 57,750 |  |  |  | (33 | ) |  |  | 71,073 |  |  |  | (34 | )
Bill of lading guarantees |  |  | 128 |  |  |  | - |  |  |  | 77 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | March 31, 2013 |
|  | Estimated Fair Value Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 155,525 |  |  | $ | 155,525 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 215,794 |  |  |  | 215,794 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 2,190,296 |  |  |  | 366,149 |  |  |  | 1,824,147 |  |  |  | - |
Trading securities |  |  | 4,758 |  |  |  | - |  |  |  | 4,758 |  |  |  | - |
Loans, net |  |  | 7,119,348 |  |  |  | - |  |  |  | - |  |  |  | 7,119,348 |
Investment in Federal Home Loan Bank stock |  |  | 37,130 |  |  |  | - |  |  |  | 37,130 |  |  |  | - |
Warrants |  |  | 98 |  |  |  | - |  |  |  | - |  |  |  | 98 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 7,431,517 |  |  |  | - |  |  |  | - |  |  |  | 7,431,517 |
Securities sold under agreements to repurchase |  |  | 1,244,735 |  |  |  | - |  |  |  | 1,244,735 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 126,962 |  |  |  | - |  |  |  | 126,962 |  |  |  | - |
Other borrowings |  |  | 16,232 |  |  |  | - |  |  |  | - |  |  |  | 16,232 |
Long-term debt |  |  | 101,715 |  |  |  | - |  |  |  | 101,715 |  |  |  | - |
|  | December 31, 2012 |
|  | Estimated Fair Value Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 144,909 |  |  | $ | 144,909 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 411,983 |  |  |  | 411,983 |  |  |  | - |  |  |  | - |
Securities held-to-maturity |  |  | 823,906 |  |  |  | - |  |  |  | 823,906 |  |  |  | - |
Securities available-for-sale |  |  | 1,291,480 |  |  |  | 526,165 |  |  |  | 765,315 |  |  |  | - |
Trading securities |  |  | 4,703 |  |  |  | - |  |  |  | 4,703 |  |  |  | - |
Loans, net |  |  | 7,169,732 |  |  |  | - |  |  |  | - |  |  |  | 7,169,732 |
Investment in Federal Home Loan Bank stock |  |  | 41,272 |  |  |  | - |  |  |  | 41,272 |  |  |  | - |
Warrants |  |  | 104 |  |  |  | - |  |  |  | - |  |  |  | 104 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 7,389,015 |  |  |  | - |  |  |  | - |  |  |  | 7,389,015 |
Securities sold under agreements to repurchase |  |  | 1,361,585 |  |  |  | - |  |  |  | 1,361,585 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 146,789 |  |  |  | - |  |  |  | 146,789 |  |  |  | - |
Other borrowings |  |  | 14,573 |  |  |  | - |  |  |  | - |  |  |  | 14,573 |
Long-term debt |  |  | 98,392 |  |  |  | - |  |  |  | 98,392 |  |  |  | - |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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 Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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 107 -Paragraph 10 -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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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