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Note 14 - Fair Value of Financial Instruments (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 206,123 |  |  | $ | 206,123 |  |  | $ | 225,333 |  |  | $ | 225,333 |
Short-term investments |  |  | 351,603 |  |  |  | 351,603 |  |  |  | 374,957 |  |  |  | 374,957 |
Securities available-for-sale |  |  | 1,471,584 |  |  |  | 1,471,584 |  |  |  | 1,242,509 |  |  |  | 1,242,509 |
Loans, net |  |  | 14,469,444 |  |  | 14,814,173 |  |  |  | 13,871,832 |  |  |  | 13,928,162 |
Equity securities |  |  | 32,498 |  |  |  | 32,498 |  |  |  | 25,098 |  |  |  | 25,098 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 44 |  |  |  | 44 |  |  |  | 184 |  |  |  | 184 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 109,659 |  |  | $ | 638 |  |  | $ | 86,875 |  |  | $ | 397 |
Interest rate swaps |  |  | 123,574 |  |  |  | 1,440 |  |  |  | 467,410 |  |  |  | 7,810 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 14,362,922 |  |  | $ | 14,417,628 |  |  | $ | 13,702,340 |  |  | $ | 13,754,028 |
Advances from Federal Home Loan Bank |  |  | 550,000 |  |  |  | 551,591 |  |  |  | 530,000 |  |  |  | 529,500 |
Other borrowings |  |  | 49,663 |  |  |  | 43,084 |  |  |  | 35,756 |  |  |  | 34,031 |
Long-term debt |  |  | 169,761 |  |  |  | 121,592 |  |  |  | 189,448 |  |  |  | 132,615 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 1,698 |  |  | $ | 14 |  |  | $ | 1,215 |  |  | $ | 6 |
Foreign exchange contracts |  |  | 95,600 |  |  |  | 876 |  |  |  | 94,977 |  |  |  | 1,763 |
Interest rate swaps |  |  | 584,226 |  |  |  | 13,779 |  |  |  | 265,166 |  |  |  | 1,543 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 3,019,604 |  |  | $ | (8,916 | ) |  | $ | 2,691,579 |  |  | $ | (8,843 | )
Standby letters of credit |  |  | 255,584 |  |  |  | (2,630 | ) |  |  | 245,087 |  |  |  | (2,662 | )
Other letters of credit |  |  | 24,086 |  |  |  | (21 | ) |  |  | 35,759 |  |  |  | (30 | )
Bill of lading guarantees |  |  | 188 |  |  |  | — |  |  |  | 730 |  |  |  | — |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of June 30, 2019 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 206,123 |  |  | $ | 206,123 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 351,603 |  |  |  | 351,603 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,471,584 |  |  |  | 49,791 |  |  |  | 1,421,793 |  |  |  | — |
Loans, net |  | 14,814,173 |  |  |  | — |  |  |  | — |  |  | 14,814,173 |
Equity securities |  |  | 32,498 |  |  |  | 32,498 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Warrants |  |  | 44 |  |  |  | — |  |  |  | — |  |  |  | 44 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 14,417,628 |  |  |  | — |  |  |  | — |  |  |  | 14,417,628 |
Advances from Federal Home Loan Bank |  |  | 551,591 |  |  |  | — |  |  |  | 551,591 |  |  |  | — |
Other borrowings |  |  | 43,084 |  |  |  | — |  |  |  | — |  |  |  | 43,084 |
Long-term debt |  |  | 121,592 |  |  |  | — |  |  |  | 121,592 |  |  |  | — |
|  | 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 |  |  | 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 |  |  |  | — |

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