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Note 12 - Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | June 30, 2015 |  |  | December 31, 2014 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 166,933 |  |  | $ | 166,933 |  |  | $ | 176,830 |  |  | $ | 176,830 |
Short-term investments |  |  | 48,711 |  |  |  | 48,711 |  |  |  | 489,614 |  |  |  | 489,614 |
Securities available-for-sale |  |  | 1,545,699 |  |  |  | 1,545,699 |  |  |  | 1,318,935 |  |  |  | 1,318,935 |
Loans held for sale |  |  | - |  |  |  | - |  |  |  | 973 |  |  |  | 1,225 |
Loans, net |  |  | 9,338,364 |  |  |  | 9,271,167 |  |  |  | 8,740,268 |  |  |  | 8,688,072 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 30,785 |  |  |  | 30,785 |
Warrants |  |  | 32 |  |  |  | 32 |  |  |  | 27 |  |  |  | 27 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 193,066 |  |  | $ | 2,326 |  |  | $ | 167,005 |  |  | $ | 1,876 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 9,338,863 |  |  | $ | 9,341,551 |  |  | $ | 8,783,460 |  |  | $ | 8,785,342 |
Securities sold under agreements to repurchase |  |  | 400,000 |  |  |  | 419,915 |  |  |  | 450,000 |  |  |  | 473,816 |
Advances from Federal Home Loan Bank |  |  | 210,000 |  |  |  | 210,020 |  |  |  | 425,000 |  |  |  | 424,974 |
Other borrowings |  |  | 20,261 |  |  |  | 17,571 |  |  |  | 19,934 |  |  |  | 17,978 |
Long-term debt |  |  | 119,136 |  |  |  | 59,015 |  |  |  | 119,136 |  |  |  | 59,425 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 188,048 |  |  | $ | 3,201 |  |  | $ | 178,868 |  |  | $ | 5,007 |
Interest rate swaps |  |  | 298,538 |  |  |  | 4,095 |  |  |  | 300,480 |  |  |  | 4,626 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,003,486 |  |  | $ | (4,123 | ) |  | $ | 2,071,766 |  |  | $ | (3,442 | )
Standby letters of credit |  |  | 50,293 |  |  |  | (202 | ) |  |  | 53,910 |  |  |  | (243 | )
Other letters of credit |  |  | 57,204 |  |  |  | (35 | ) |  |  | 48,142 |  |  |  | (29 | )
Bill of lading guarantees |  |  | 199 |  |  |  | (1 | ) |  |  | 108 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | June 30, 2015 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 166,933 |  |  | $ | 166,933 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 48,711 |  |  |  | 48,711 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,545,699 |  |  |  | 305,954 |  |  |  | 1,239,745 |  |  |  | - |
Loans, net |  |  | 9,271,167 |  |  |  | - |  |  |  | - |  |  |  | 9,271,167 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 32 |  |  |  | - |  |  |  | - |  |  |  | 32 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 9,341,551 |  |  |  | - |  |  |  | - |  |  |  | 9,341,551 |
Securities sold under agreements to repurchase |  |  | 419,915 |  |  |  | - |  |  |  | 419,915 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 210,020 |  |  |  | - |  |  |  | 210,020 |  |  |  | - |
Other borrowings |  |  | 17,571 |  |  |  | - |  |  |  | - |  |  |  | 17,571 |
Long-term debt |  |  | 59,015 |  |  |  | - |  |  |  | 59,015 |  |  |  | - |
|  | 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 agreements 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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