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Note 12 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2015 |  |  | December 31, 2014 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 182,159 |  |  | $ | 182,159 |  |  | $ | 176,830 |  |  | $ | 176,830 |
Short-term investments |  |  | 618,726 |  |  |  | 618,726 |  |  |  | 489,614 |  |  |  | 489,614 |
Securities available-for-sale |  |  | 1,203,682 |  |  |  | 1,203,682 |  |  |  | 1,318,935 |  |  |  | 1,318,935 |
Loans held for sale |  |  | - |  |  |  | - |  |  |  | 973 |  |  |  | 1,225 |
Loans, net |  |  | 9,057,592 |  |  |  | 9,001,232 |  |  |  | 8,740,268 |  |  |  | 8,688,072 |
Investment in Federal Home Loan Bank stock |  |  | 25,000 |  |  |  | 25,000 |  |  |  | 30,785 |  |  |  | 30,785 |
Warrants |  |  | 21 |  |  |  | 21 |  |  |  | 27 |  |  |  | 27 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 127,172 |  |  | $ | 1,615 |  |  | $ | 167,005 |  |  | $ | 1,876 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 9,113,250 |  |  | $ | 9,114,489 |  |  | $ | 8,783,460 |  |  | $ | 8,785,342 |
Securities sold under agreements to repurchase |  |  | 400,000 |  |  |  | 422,161 |  |  |  | 450,000 |  |  |  | 473,816 |
Advances from Federal Home Loan Bank |  |  | 485,000 |  |  |  | 484,983 |  |  |  | 425,000 |  |  |  | 424,974 |
Other borrowings |  |  | 22,482 |  |  |  | 19,396 |  |  |  | 19,934 |  |  |  | 17,978 |
Long-term debt |  |  | 119,136 |  |  |  | 60,020 |  |  |  | 119,136 |  |  |  | 59,425 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 158,331 |  |  | $ | 4,959 |  |  | $ | 178,868 |  |  | $ | 5,007 |
Interest rate swaps |  |  | 299,497 |  |  |  | 8,610 |  |  |  | 300,480 |  |  |  | 4,626 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,027,773 |  |  | $ | (3,740 | ) |  | $ | 2,071,766 |  |  | $ | (3,442 | )
Standby letters of credit |  |  | 49,585 |  |  |  | (238 | ) |  |  | 53,910 |  |  |  | (243 | )
Other letters of credit |  |  | 50,558 |  |  |  | (34 | ) |  |  | 48,142 |  |  |  | (29 | )
Bill of lading guarantees |  |  | 159 |  |  |  | - |  |  |  | 108 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | March 31, 2015 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 182,159 |  |  | $ | 182,159 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 618,726 |  |  |  | 618,726 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,203,682 |  |  |  | 356,104 |  |  |  | 847,578 |  |  |  | - |
Loans, net |  |  | 9,001,232 |  |  |  | - |  |  |  | - |  |  |  | 9,001,232 |
Investment in Federal Home Loan Bank stock |  |  | 25,000 |  |  |  | - |  |  |  | 25,000 |  |  |  | - |
Warrants |  |  | 21 |  |  |  | - |  |  |  | - |  |  |  | 21 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 9,114,489 |  |  |  | - |  |  |  | - |  |  |  | 9,114,489 |
Securities sold under agreements to repurchase |  |  | 422,161 |  |  |  | - |  |  |  | 422,161 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 484,983 |  |  |  | - |  |  |  | 484,983 |  |  |  | - |
Other borrowings |  |  | 19,396 |  |  |  | - |  |  |  | - |  |  |  | 19,396 |
Long-term debt |  |  | 60,020 |  |  |  | - |  |  |  | 60,020 |  |  |  | - |
|  | 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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