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Note 13 - Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | September 30, 2018 |  |  | December 31, 2017 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 204,178 |  |  | $ | 204,178 |  |  | $ | 247,056 |  |  | $ | 247,056 |
Short-term investments and interest bearing deposits |  |  | 377,839 |  |  |  | 377,839 |  |  |  | 292,745 |  |  |  | 292,745 |
Securities available-for-sale |  |  | 1,283,060 |  |  |  | 1,283,060 |  |  |  | 1,333,626 |  |  |  | 1,333,626 |
Equity securities |  |  | 23,522 |  |  |  | 23,522 |  |  |  | - |  |  |  | - |
Loans held for sale |  |  | - |  |  |  | - |  |  |  | 8,000 |  |  |  | 8,000 |
Loans, net (1) |  |  | 13,522,103 |  |  |  | 13,502,232 |  |  |  | 12,743,766 |  |  |  | 12,663,049 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 23,085 |  |  |  | 23,085 |
Warrants |  |  | 168 |  |  |  | 168 |  |  |  | 91 |  |  |  | 91 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 53,361 |  |  | $ | 400 |  |  | $ | 108,530 |  |  | $ | 1,832 |
Interest rate swaps |  |  | 756,819 |  |  |  | 18,419 |  |  |  | 514,159 |  |  |  | 5,218 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 13,581,078 |  |  | $ | 13,617,846 |  |  | $ | 12,689,893 |  |  | $ | 12,700,674 |
Securities sold under agreements to repurchase |  |  | - |  |  |  | - |  |  |  | 100,000 |  |  |  | 100,163 |
Advances from Federal Home Loan Bank |  |  | 315,000 |  |  |  | 314,507 |  |  |  | 430,000 |  |  |  | 429,482 |
Other borrowings |  |  | 35,585 |  |  |  | 33,791 |  |  |  | 52,885 |  |  |  | 51,075 |
Long-term debt |  |  | 194,136 |  |  |  | 142,068 |  |  |  | 194,136 |  |  |  | 141,865 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 1,623 |  |  | $ | 4 |  |  | $ | 1,014 |  |  | $ | 9 |
Foreign exchange contracts |  |  | 117,634 |  |  |  | 1,648 |  |  |  | 32,127 |  |  |  | 453 |
Interest rate swaps |  |  | - |  |  |  | - |  |  |  | 145,399 |  |  |  | 2,699 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,645,086 |  |  | $ | (9,095 | ) |  | $ | 2,366,368 |  |  | $ | (7,224 | )
Standby letters of credit |  |  | 167,050 |  |  |  | (1,509 | ) |  |  | 140,814 |  |  |  | (1,805 | )
Other letters of credit |  |  | 30,420 |  |  |  | (20 | ) |  |  | 27,353 |  |  |  | (52 | )
Bill of lading guarantees |  |  | 1,108 |  |  |  | - |  |  |  | 24 |  |  |  | - |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of September 30, 2018 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 204,178 |  |  | $ | 204,178 |  |  | $ | - |  |  | $ | - |
Short-term investments and interest bearing deposits |  |  | 377,839 |  |  |  | 377,839 |  |  |  | - |  |  |  | - |
Debt securities available-for-sale |  |  | 1,283,060 |  |  |  | 199,374 |  |  |  | 1,083,686 |  |  |  | - |
Equity securities |  |  | 23,522 |  |  |  | 23,522 |  |  |  | - |  |  |  | - |
Loans, net (1) |  |  | 13,502,232 |  |  |  | - |  |  |  | - |  |  |  | 13,502,232 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 168 |  |  |  | - |  |  |  | - |  |  |  | 168 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 13,617,846 |  |  |  | - |  |  |  | - |  |  |  | 13,617,846 |
Advances from Federal Home Loan Bank |  |  | 314,507 |  |  |  | - |  |  |  | 314,507 |  |  |  | - |
Other borrowings |  |  | 33,791 |  |  |  | - |  |  |  | - |  |  |  | 33,791 |
Long-term debt |  |  | 142,068 |  |  |  | - |  |  |  | 142,068 |  |  |  | - |
|  | 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 and interest bearing deposits |  |  | 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 (1) |  |  | 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 |  |  |  | - |

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