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Note 17 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2015 |  |  | December 31, 2014 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 180,130 |  |  | $ | 180,130 |  |  | $ | 176,830 |  |  | $ | 176,830 |
Short-term investments |  |  | 536,880 |  |  |  | 536,880 |  |  |  | 489,614 |  |  |  | 489,614 |
Securities available-for-sale |  |  | 1,586,352 |  |  |  | 1,586,352 |  |  |  | 1,318,935 |  |  |  | 1,318,935 |
Loans held for sale |  |  | 6,676 |  |  |  | 6,676 |  |  |  | 973 |  |  |  | 1,225 |
Loans, net |  |  | 10,016,227 |  |  |  | 9,938,810 |  |  |  | 8,740,268 |  |  |  | 8,688,072 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 30,785 |  |  |  | 30,785 |
Warrants |  |  | 62 |  |  |  | 62 |  |  |  | 27 |  |  |  | 27 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  |  | 100,602 |  |  |  | 3,339 |  |  |  | 167,005 |  |  |  | 1,876 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 10,509,087 |  |  |  | 10,509,879 |  |  | $ | 8,783,460 |  |  | $ | 8,785,342 |
Securities sold under agreements to repurchase |  |  | 400,000 |  |  |  | 413,417 |  |  |  | 450,000 |  |  |  | 473,816 |
Advances from Federal Home Loan Bank |  |  | 275,000 |  |  |  | 274,488 |  |  |  | 425,000 |  |  |  | 424,974 |
Other borrowings |  |  | 18,593 |  |  |  | 16,684 |  |  |  | 19,934 |  |  |  | 17,978 |
Long-term debt |  |  | 119,136 |  |  |  | 58,420 |  |  |  | 119,136 |  |  |  | 59,425 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 9,396 |  |  | $ | 28 |  |  | $ | - |  |  | $ | - |
Foreign exchange contracts |  | $ | 115,418 |  |  | $ | 4,124 |  |  | $ | 178,868 |  |  | $ | 5,007 |
Interest rate swaps |  |  | 459,416 |  |  |  | 6,496 |  |  |  | 300,480 |  |  |  | 4,626 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 1,971,848 |  |  | $ | (5,570 | ) |  | $ | 2,071,766 |  |  | $ | (3,442 | )
Standby letters of credit |  |  | 49,081 |  |  |  | (194 | ) |  |  | 53,910 |  |  |  | (243 | )
Other letters of credit |  |  | 38,131 |  |  |  | (22 | ) |  |  | 48,142 |  |  |  | (29 | )
Bill of lading guarantees |  |  | 454 |  |  |  | (1 | ) |  |  | 108 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | As of 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 agreement 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 |  |  |  | - |
|  | As of December 31, 2014 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 176,830 |  |  | $ | 176,830 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 489,614 |  |  |  | 489,614 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,318,935 |  |  |  | 669,870 |  |  |  | 649,065 |  |  |  | - |
Loans held-for-sale |  |  | 1,225 |  |  |  | - |  |  |  | - |  |  |  | 1,225 |
Loans, net |  |  | 8,688,072 |  |  |  | - |  |  |  | - |  |  |  | 8,688,072 |
Investment in Federal Home Loan Bank stock |  |  | 30,785 |  |  |  | - |  |  |  | 30,785 |  |  |  | - |
Warrants |  |  | 27 |  |  |  | - |  |  |  | - |  |  |  | 27 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 8,785,342 |  |  |  | - |  |  |  | - |  |  |  | 8,785,342 |
Securities sold under agreement to repurchase |  |  | 473,816 |  |  |  | - |  |  |  | 473,816 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 424,974 |  |  |  | - |  |  |  | 424,974 |  |  |  | - |
Other borrowings |  |  | 17,978 |  |  |  | - |  |  |  | - |  |  |  | 17,978 |
Long-term debt |  |  | 59,425 |  |  |  | - |  |  |  | 59,425 |  |  |  | - |

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