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Note 16 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 225,333 |  |  | $ | 225,333 |  |  | $ | 247,056 |  |  | $ | 247,056 |
Short-term investments |  |  | 374,957 |  |  |  | 374,957 |  |  |  | 292,745 |  |  |  | 292,745 |
Securities available-for-sale |  |  | 1,242,509 |  |  |  | 1,242,509 |  |  |  | 1,333,626 |  |  |  | 1,333,626 |
Loans held for sale |  |  | - |  |  |  | - |  |  |  | 8,000 |  |  |  | 8,000 |
Loans, net (1) |  |  | 13,871,832 |  |  |  | 13,928,162 |  |  |  | 12,743,766 |  |  |  | 12,663,049 |
Equity securities |  |  | 25,098 |  |  |  | 25,098 |  |  |  | - |  |  |  | - |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 23,085 |  |  |  | 23,085 |
Warrants |  |  | 184 |  |  |  | 184 |  |  |  | 91 |  |  |  | 91 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 86,875 |  |  | $ | 397 |  |  | $ | 108,530 |  |  | $ | 1,832 |
Interest rate swaps |  |  | 467,410 |  |  |  | 7,810 |  |  |  | 514,159 |  |  |  | 5,218 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 13,702,340 |  |  | $ | 13,754,028 |  |  | $ | 12,689,893 |  |  | $ | 12,700,674 |
Securities sold under agreements to repurchase |  |  | - |  |  |  | - |  |  |  | 100,000 |  |  |  | 100,163 |
Advances from Federal Home Loan Bank |  |  | 530,000 |  |  |  | 529,500 |  |  |  | 430,000 |  |  |  | 429,482 |
Other borrowings |  |  | 35,756 |  |  |  | 34,031 |  |  |  | 52,885 |  |  |  | 51,075 |
Long-term debt |  |  | 189,448 |  |  |  | 132,615 |  |  |  | 194,136 |  |  |  | 141,865 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 1,215 |  |  | $ | 6 |  |  | $ | 1,014 |  |  | $ | 9 |
Foreign exchange contracts |  |  | 94,977 |  |  |  | 1,763 |  |  |  | 32,127 |  |  |  | 453 |
Interest rate swaps |  |  | 265,166 |  |  |  | 1,543 |  |  |  | 145,399 |  |  |  | 2,699 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,691,579 |  |  | $ | (8,843 | ) |  | $ | 2,366,368 |  |  | $ | (7,224 | )
Standby letters of credit |  |  | 245,087 |  |  |  | (2,662 | ) |  |  | 140,814 |  |  |  | (1,805 | )
Other letters of credit |  |  | 35,759 |  |  |  | (30 | ) |  |  | 27,353 |  |  |  | (52 | )
Bill of lading guarantees |  |  | 730 |  |  |  | - |  |  |  | 24 |  |  |  | (0 | )
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2018 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 225,333 |  |  | $ | 225,333 |  |  | $ | - |  |  | $ | - |
Short-term investments |  |  | 374,957 |  |  |  | 374,957 |  |  |  | - |  |  |  | - |
Securities available-for-sale |  |  | 1,242,509 |  |  |  | 124,751 |  |  |  | 1,117,758 |  |  |  | - |
Loans, net (1) |  |  | 13,928,162 |  |  |  | - |  |  |  | - |  |  |  | 13,928,162 |
Equity securities |  |  | 25,098 |  |  |  | 25,098 |  |  |  | - |  |  |  | - |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | - |  |  |  | 17,250 |  |  |  | - |
Warrants |  |  | 184 |  |  |  | - |  |  |  | - |  |  |  | 184 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 13,754,028 |  |  |  | - |  |  |  | - |  |  |  | 13,754,028 |
Advances from Federal Home Loan Bank |  |  | 529,500 |  |  |  | - |  |  |  | 529,500 |  |  |  | - |
Other borrowings |  |  | 34,031 |  |  |  | - |  |  |  | - |  |  |  | 34,031 |
Long-term debt |  |  | 132,615 |  |  |  | - |  |  |  | 132,615 |  |  |  | - |
|  | 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 (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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