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Note 12 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2016 |  |  | December 31, 2015 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 192,642 |  |  | $ | 192,642 |  |  | $ | 180,130 |  |  | $ | 180,130 |
Short-term investments |  |  | 432,384 |  |  |  | 432,384 |  |  |  | 536,880 |  |  |  | 536,880 |
Securities available-for-sale |  |  | 1,485,124 |  |  |  | 1,485,124 |  |  |  | 1,586,352 |  |  |  | 1,586,352 |
Loans held for sale |  |  | - |  |  |  | - |  |  |  | 6,676 |  |  |  | 6,676 |
Loans, net |  |  | 10,221,510 |  |  |  | 10,142,747 |  |  |  | 10,016,227 |  |  |  | 9,938,810 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 94 |  |  |  | 94 |  |  |  | 62 |  |  |  | 62 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 138,201 |  |  | $ | 3,314 |  |  | $ | 100,602 |  |  | $ | 3,339 |
|  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 10,324,116 |  |  | $ | 10,331,030 |  |  | $ | 10,509,087 |  |  | $ | 10,509,879 |
Securities sold under agreements to repurchase |  |  | 400,000 |  |  |  | 413,195 |  |  |  | 400,000 |  |  |  | 413,417 |
Advances from Federal Home Loan Bank |  |  | 475,000 |  |  |  | 475,128 |  |  |  | 275,000 |  |  |  | 274,488 |
Other borrowings |  |  | 17,792 |  |  |  | 15,478 |  |  |  | 18,593 |  |  |  | 16,684 |
Long-term debt |  |  | 119,136 |  |  |  | 58,951 |  |  |  | 119,136 |  |  |  | 58,420 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Option contracts |  | $ | - |  |  | $ | - |  |  | $ | 9,396 |  |  | $ | 28 |
Foreign exchange contracts |  |  | 73,006 |  |  |  | 913 |  |  |  | 115,418 |  |  |  | 4,124 |
Interest rate swaps |  |  | 476,590 |  |  |  | 14,878 |  |  |  | 459,416 |  |  |  | 6,496 |
|  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,098,360 |  |  | $ | (5,722 | ) |  | $ | 1,971,848 |  |  | $ | (5,570 | )
Standby letters of credit |  |  | 49,334 |  |  |  | (199 | ) |  |  | 49,081 |  |  |  | (194 | )
Other letters of credit |  |  | 30,883 |  |  |  | (18 | ) |  |  | 38,131 |  |  |  | (22 | )
Bill of lading guarantees |  |  | 52 |  |  |  | - |  |  |  | 454 |  |  |  | (1 | )
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | March 31, 2016 |
|  | Estimated Fair Value Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 192,642 |  |  | $ | 192,642 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 432,384 |  |  |  | 432,384 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,485,124 |  |  |  | 230,719 |  |  |  | 1,254,405 |  |  |  | - |
Loans, net |  |  | 10,142,747 |  |  |  | - |  |  |  | - |  |  |  | 10,142,747 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 94 |  |  |  | - |  |  |  | - |  |  |  | 94 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 10,331,030 |  |  |  | - |  |  |  | - |  |  |  | 10,331,030 |
Securities sold under agreements to repurchase |  |  | 413,195 |  |  |  | - |  |  |  | 413,195 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 475,128 |  |  |  | - |  |  |  | 475,128 |  |  |  | - |
Other borrowings |  |  | 15,478 |  |  |  | - |  |  |  | - |  |  |  | 15,478 |
Long-term debt |  |  | 58,951 |  |  |  | - |  |  |  | 58,951 |  |  |  | - |
|  | December 31, 2015 |
|  | Estimated Fair Value Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 180,130 |  |  | $ | 180,130 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 536,880 |  |  |  | 536,880 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,586,352 |  |  |  | 290,121 |  |  |  | 1,296,231 |  |  |  | - |
Loans held-for-sale |  |  | 6,676 |  |  |  | - |  |  |  | - |  |  |  | 6,676 |
Loans, net |  |  | 9,938,810 |  |  |  | - |  |  |  | - |  |  |  | 9,938,810 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 62 |  |  |  | - |  |  |  | - |  |  |  | 62 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 10,509,879 |  |  |  | - |  |  |  | - |  |  |  | 10,509,879 |
Securities sold under agreements to repurchase |  |  | 413,417 |  |  |  | - |  |  |  | 413,417 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 274,488 |  |  |  | - |  |  |  | - |  |  |  | 274,488 |
Other borrowings |  |  | 16,684 |  |  |  | - |  |  |  | - |  |  |  | 16,684 |
Long-term debt |  |  | 58,420 |  |  |  | - |  |  |  | 58,420 |  |  |  | - |

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