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Note 14 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2019
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 194,928 |  |  | $ | 194,928 |  |  | $ | 225,333 |  |  | $ | 225,333 |
Short-term investments |  |  | 343,452 |  |  |  | 343,452 |  |  |  | 374,957 |  |  |  | 374,957 |
Securities available-for-sale |  |  | 1,309,853 |  |  |  | 1,309,853 |  |  |  | 1,242,509 |  |  |  | 1,242,509 |
Loans, net |  |  | 14,153,318 |  |  |  | 14,373,444 |  |  |  | 13,871,832 |  |  |  | 13,928,162 |
Equity securities |  |  | 29,261 |  |  |  | 29,261 |  |  |  | 25,098 |  |  |  | 25,098 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 181 |  |  |  | 181 |  |  |  | 184 |  |  |  | 184 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 76,768 |  |  | $ | 459 |  |  | $ | 86,875 |  |  | $ | 397 |
Interest rate swaps |  |  | 358,509 |  |  |  | 4,480 |  |  |  | 467,410 |  |  |  | 7,810 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  | $ | 14,086,364 |  |  | $ | 14,143,470 |  |  | $ | 13,702,340 |  |  | $ | 13,754,028 |
Advances from Federal Home Loan Bank |  |  | 420,000 |  |  |  | 420,450 |  |  |  | 530,000 |  |  |  | 529,500 |
Other borrowings |  |  | 48,099 |  |  |  | 42,361 |  |  |  | 35,756 |  |  |  | 34,031 |
Long-term debt |  |  | 174,448 |  |  |  | 123,897 |  |  |  | 189,448 |  |  |  | 132,615 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 2,188 |  |  | $ | 12 |  |  | $ | 1,215 |  |  | $ | 6 |
Foreign exchange contracts |  |  | 57,273 |  |  |  | 645 |  |  |  | 94,977 |  |  |  | 1,763 |
Interest rate swaps |  |  | 346,357 |  |  |  | 5,727 |  |  |  | 265,166 |  |  |  | 1,543 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,776,325 |  |  | $ | (5,703 | ) |  | $ | 2,691,579 |  |  | $ | (8,843 | )
Standby letters of credit |  |  | 260,268 |  |  |  | (2,890 | ) |  |  | 245,087 |  |  |  | (2,662 | )
Other letters of credit |  |  | 29,354 |  |  |  | (28 | ) |  |  | 35,759 |  |  |  | (30 | )
Bill of lading guarantees |  |  | 662 |  |  |  | — |  |  |  | 730 |  |  |  | — |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of March 31, 2019 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 194,928 |  |  | $ | 194,928 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 343,452 |  |  |  | 343,452 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,309,853 |  |  |  | 149,240 |  |  |  | 1,160,613 |  |  |  | — |
Loans, net |  |  | 14,373,444 |  |  |  | — |  |  |  | — |  |  |  | 14,373,444 |
Equity securities |  |  | 29,261 |  |  |  | 29,261 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Warrants |  |  | 181 |  |  |  | — |  |  |  | — |  |  |  | 181 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 14,143,470 |  |  |  | — |  |  |  | — |  |  |  | 14,143,470 |
Advances from Federal Home Loan Bank |  |  | 420,450 |  |  |  | — |  |  |  | 420,450 |  |  |  | — |
Other borrowings |  |  | 42,361 |  |  |  | — |  |  |  | — |  |  |  | 42,361 |
Long-term debt |  |  | 123,897 |  |  |  | — |  |  |  | 123,897 |  |  |  | — |
|  | 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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