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Note 12 - Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2013
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | September 30, 2013 |  |  | December 31, 2012 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 201,815 |  |  | $ | 201,815 |  |  | $ | 144,909 |  |  | $ | 144,909 |
Short-term investments |  |  | 389,024 |  |  |  | 389,024 |  |  |  | 411,983 |  |  |  | 411,983 |
Securities held-to-maturity |  |  | - |  |  |  | - |  |  |  | 773,768 |  |  |  | 823,906 |
Securities available-for-sale |  |  | 1,743,309 |  |  |  | 1,743,309 |  |  |  | 1,291,480 |  |  |  | 1,291,480 |
Trading securities |  |  | 4,855 |  |  |  | 4,855 |  |  |  | 4,703 |  |  |  | 4,703 |
Loans, net |  |  | 7,637,628 |  |  |  | 7,460,436 |  |  |  | 7,235,587 |  |  |  | 7,169,732 |
Investment in Federal Home Loan Bank stock |  |  | 28,683 |  |  |  | 28,683 |  |  |  | 41,272 |  |  |  | 41,272 |
Warrants |  |  | 49 |  |  |  | 49 |  |  |  | 104 |  |  |  | 104 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Option contracts |  | $ | - |  |  | $ | - |  |  | $ | 105 |  |  | $ | - |
Foreign exchange contracts |  |  | 277,430 |  |  |  | 5,816 |  |  |  | 188,145 |  |  |  | 2,924 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 7,918,543 |  |  | $ | 7,917,105 |  |  | $ | 7,383,225 |  |  | $ | 7,389,015 |
Securities sold under agreements to repurchase |  |  | 800,000 |  |  |  | 858,315 |  |  |  | 1,250,000 |  |  |  | 1,361,585 |
Advances from Federal Home Loan Bank |  |  | 376,200 |  |  |  | 376,429 |  |  |  | 146,200 |  |  |  | 146,789 |
Other borrowings |  |  | 19,108 |  |  |  | 16,020 |  |  |  | 18,713 |  |  |  | 14,573 |
Long-term debt |  |  | 171,136 |  |  |  | 97,604 |  |  |  | 171,136 |  |  |  | 98,392 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Option contracts |  | $ | - |  |  | $ | 1 |  |  | $ | 104 |  |  | $ | 2 |
Foreign exchange contracts |  |  | 185,558 |  |  |  | 4,725 |  |  |  | 133,669 |  |  |  | 1,586 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 1,760,520 |  |  | $ | (1,919 | ) |  | $ | 1,740,463 |  |  | $ | (1,875 | )
Standby letters of credit |  |  | 46,457 |  |  |  | (200 | ) |  |  | 44,672 |  |  |  | (204 | )
Other letters of credit |  |  | 88,601 |  |  |  | (50 | ) |  |  | 71,073 |  |  |  | (34 | )
Bill of lading guarantees |  |  | 172 |  |  |  | - |  |  |  | 77 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | September 30, 2013 |
|  | Estimated Fair Value Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 201,815 |  |  | $ | 201,815 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 389,024 |  |  |  | 389,024 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,743,309 |  |  |  | 466,145 |  |  |  | 1,277,164 |  |  |  | - |
Trading securities |  |  | 4,855 |  |  |  | - |  |  |  | 4,855 |  |  |  | - |
Loans, net |  |  | 7,460,436 |  |  |  | - |  |  |  | - |  |  |  | 7,460,436 |
Investment in Federal Home Loan Bank stock |  |  | 28,683 |  |  |  | - |  |  |  | 28,683 |  |  |  | - |
Warrants |  |  | 49 |  |  |  | - |  |  |  | - |  |  |  | 49 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 7,917,105 |  |  |  | - |  |  |  | - |  |  |  | 7,917,105 |
Securities sold under agreements to repurchase |  |  | 858,315 |  |  |  | - |  |  |  | 858,315 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 376,429 |  |  |  | - |  |  |  | 376,429 |  |  |  | - |
Other borrowings |  |  | 16,020 |  |  |  | - |  |  |  | - |  |  |  | 16,020 |
Long-term debt |  |  | 97,604 |  |  |  | - |  |  |  | 97,604 |  |  |  | - |
|  | 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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