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Note 16 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 247,056 |  |  | $ | 247,056 |  |  | $ | 218,017 |  |  | $ | 218,017 |
Short-term investments |  |  | 292,745 |  |  |  | 292,745 |  |  |  | 967,067 |  |  |  | 967,067 |
Securities available-for-sale |  |  | 1,333,626 |  |  |  | 1,333,626 |  |  |  | 1,314,345 |  |  |  | 1,314,345 |
Loans held for sale |  |  | 8,000 |  |  |  | 8,000 |  |  |  | 7,500 |  |  |  | 7,500 |
Loans, net |  |  | 12,743,766 |  |  |  | 12,663,049 |  |  |  | 11,077,315 |  |  |  | 11,006,344 |
Investment in Federal Home Loan Bank stock |  |  | 23,085 |  |  |  | 23,085 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 91 |  |  |  | 91 |  |  |  | 79 |  |  |  | 79 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 108,530 |  |  | $ | 1,832 |  |  | $ | 82,439 |  |  | $ | 1,302 |
Interest rate swaps |  |  | 514,159 |  |  |  | 5,218 |  |  |  | 361,526 |  |  |  | 938 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 12,689,893 |  |  | $ | 12,700,674 |  |  | $ | 11,674,726 |  |  | $ | 11,680,017 |
Securities sold under agreements to repurchase |  |  | 100,000 |  |  |  | 100,163 |  |  |  | 350,000 |  |  |  | 351,989 |
Advances from Federal Home Loan Bank |  |  | 430,000 |  |  |  | 429,482 |  |  |  | 350,000 |  |  |  | 350,062 |
Other borrowings |  |  | 52,885 |  |  |  | 51,075 |  |  |  | 17,662 |  |  |  | 15,944 |
Long-term debt |  |  | 194,136 |  |  |  | 141,865 |  |  |  | 119,136 |  |  |  | 63,169 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 1,014 |  |  | $ | 9 |  |  | $ | 12,117 |  |  | $ | 121 |
Foreign exchange contracts |  |  | 32,127 |  |  |  | 453 |  |  |  | 89,545 |  |  |  | 3,132 |
Interest rate swaps |  |  | 145,399 |  |  |  | 2,699 |  |  |  | 119,136 |  |  |  | 3,744 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,366,368 |  |  | $ | (7,224 | ) |  | $ | 2,062,241 |  |  | $ | (6,025 | )
Standby letters of credit |  |  | 140,814 |  |  |  | (1,805 | ) |  |  | 75,396 |  |  |  | (668 | )
Other letters of credit |  |  | 27,353 |  |  |  | (52 | ) |  |  | 37,283 |  |  |  | (16 | )
Bill of lading guarantees |  |  | 24 |  |  |  | (0 | ) |  |  | 75 |  |  |  | (0 | )
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2017 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 247,056 |  |  | $ | 247,056 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 292,745 |  |  |  | 292,745 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,333,626 |  |  |  | 277,622 |  |  |  | 1,056,004 |  |  |  | - |
Loans held-for-sale |  |  | 8,000 |  |  |  | - |  |  |  | - |  |  |  | 8,000 |
Loans, net |  |  | 12,663,049 |  |  |  | - |  |  |  | - |  |  |  | 12,663,049 |
Investment in Federal Home Loan Bank stock |  |  | 23,085 |  |  |  | - |  |  |  | 23,085 |  |  |  | - |
Warrants |  |  | 91 |  |  |  | - |  |  |  | - |  |  |  | 91 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 12,700,674 |  |  |  | - |  |  |  | - |  |  |  | 12,700,674 |
Securities sold under agreement to repurchase |  |  | 100,163 |  |  |  | - |  |  |  | 100,163 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 429,482 |  |  |  | - |  |  |  | 429,482 |  |  |  | - |
Other borrowings |  |  | 51,075 |  |  |  | - |  |  |  | - |  |  |  | 51,075 |
Long-term debt |  |  | 141,865 |  |  |  | - |  |  |  | 141,865 |  |  |  | - |
|  | As of December 31, 2016 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 218,017 |  |  | $ | 218,017 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 967,067 |  |  |  | 967,067 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,314,345 |  |  |  | 513,376 |  |  |  | 800,969 |  |  |  | - |
Loans held-for-sale |  |  | 7,500 |  |  |  | - |  |  |  | - |  |  |  | 7,500 |
Loans, net |  |  | 11,006,344 |  |  |  | - |  |  |  | - |  |  |  | 11,006,344 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 79 |  |  |  | - |  |  |  | - |  |  |  | 79 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 11,680,017 |  |  |  | - |  |  |  | - |  |  |  | 11,680,017 |
Securities sold under agreement to repurchase |  |  | 351,989 |  |  |  | - |  |  |  | 351,989 |  |  |  | - |
Advances from Federal Home Loan Bank |  |  | 350,062 |  |  |  | - |  |  |  | 350,062 |  |  |  | - |
Other borrowings |  |  | 15,944 |  |  |  | - |  |  |  | - |  |  |  | 15,944 |
Long-term debt |  |  | 63,169 |  |  |  | - |  |  |  | 63,169 |  |  |  | - |

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