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Note 17 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2014 |  |  | December 31, 2013 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 176,830 |  |  | $ | 176,830 |  |  | $ | 153,747 |  |  | $ | 153,747 |
Short-term investments |  |  | 489,614 |  |  |  | 489,614 |  |  |  | 516,938 |  |  |  | 516,938 |
Securities available-for-sale |  |  | 1,318,935 |  |  |  | 1,318,935 |  |  |  | 1,586,668 |  |  |  | 1,586,668 |
Trading securities |  |  | - |  |  |  | - |  |  |  | 4,936 |  |  |  | 4,936 |
Loans held for sale |  |  | 973 |  |  |  | 1,225 |  |  |  | - |  |  |  | - |
Loans, net |  |  | 8,740,268 |  |  |  | 8,688,072 |  |  |  | 7,897,187 |  |  |  | 7,760,490 |
Investment in Federal Home Loan Bank stock |  |  | 30,785 |  |  |  | 30,785 |  |  |  | 25,000 |  |  |  | 25,000 |
Warrants |  |  | 27 |  |  |  | 27 |  |  |  | 30 |  |  |  | 30 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | - |  |  | $ | - |  |  | $ | 200 |  |  | $ | 0 |
Foreign exchange contracts |  |  | 167,005 |  |  |  | 1,876 |  |  |  | 267,644 |  |  |  | 6,182 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 8,783,460 |  |  | $ | 8,785,342 |  |  | $ | 7,981,305 |  |  | $ | 7,977,639 |
Securities sold under agreements to repurchase |  |  | 450,000 |  |  |  | 473,816 |  |  |  | 800,000 |  |  |  | 852,835 |
Advances from Federal Home Loan Bank |  |  | 425,000 |  |  |  | 424,974 |  |  |  | 521,200 |  |  |  | 521,560 |
Other borrowings |  |  | 19,934 |  |  |  | 17,978 |  |  |  | 19,062 |  |  |  | 16,107 |
Long-term debt |  |  | 119,136 |  |  |  | 59,425 |  |  |  | 121,136 |  |  |  | 58,970 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 178,868 |  |  | $ | 5,007 |  |  | $ | 236,350 |  |  | $ | 6,140 |
Interest rate swaps |  |  | 300,480 |  |  |  | 4,626 |  |  |  | - |  |  |  | - |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,071,766 |  |  | $ | (3,442 | ) |  | $ | 1,858,669 |  |  | $ | (2,187 | )
Standby letters of credit |  |  | 53,910 |  |  |  | (243 | ) |  |  | 45,058 |  |  |  | (205 | )
Other letters of credit |  |  | 48,142 |  |  |  | (29 | ) |  |  | 54,098 |  |  |  | (34 | )
Bill of lading guarantees |  |  | 108 |  |  |  | - |  |  |  | 80 |  |  |  | - |
Schedule of Fair Value of Financial Instruments [Table Text Block] |
|  | 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 |  |  |  | - |
|  | As of December 31, 2013 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 153,747 |  |  | $ | 153,747 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 516,938 |  |  |  | 516,938 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,586,668 |  |  |  | 465,917 |  |  |  | 1,120,751 |  |  |  | - |
Trading securities |  |  | 4,936 |  |  |  | - |  |  |  | 4,936 |  |  |  | - |
Loans, net |  |  | 7,760,490 |  |  |  | - |  |  |  | - |  |  |  | 7,760,490 |
Investment in Federal Home Loan Bank stock |  |  | 25,000 |  |  |  | - |  |  |  | 25,000 |  |  |  | - |
Warrants |  |  | 30 |  |  |  | - |  |  |  | - |  |  |  | 30 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 7,977,639 |  |  |  | - |  |  |  | - |  |  |  | 7,977,639 |
Securities sold under agreement to repurchase |  |  | 852,835 |  |  |  | - |  |  |  | 852,835 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 521,560 |  |  |  | - |  |  |  | 521,560 |  |  |  | - |
Other borrowings |  |  | 16,107 |  |  |  | - |  |  |  | - |  |  |  | 16,107 |
Long-term debt |  |  | 58,970 |  |  |  | - |  |  |  | 58,970 |  |  |  | - |

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