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Note 16 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2019 |  |  | December 31, 2018 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 177,240 |  |  | $ | 177,240 |  |  | $ | 225,333 |  |  | $ | 225,333 |
Short-term investments |  |  | 416,538 |  |  |  | 416,538 |  |  |  | 374,957 |  |  |  | 374,957 |
Securities available-for-sale |  |  | 1,451,842 |  |  |  | 1,451,842 |  |  |  | 1,242,509 |  |  |  | 1,242,509 |
Loans, net (1) |  |  | 14,951,631 |  |  |  | 15,444,752 |  |  |  | 13,871,832 |  |  |  | 13,928,162 |
Equity securities |  |  | 28,005 |  |  |  | 28,005 |  |  |  | 25,098 |  |  |  | 25,098 |
Investment in Federal Home Loan Bank stock |  |  | 18,090 |  |  |  | 18,090 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 39 |  |  |  | 39 |  |  |  | 184 |  |  |  | 184 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 146,397 |  |  | $ | 2,411 |  |  | $ | 86,875 |  |  | $ | 397 |
Interest rate swaps |  |  | 130,401 |  |  |  | 2,181 |  |  |  | 467,410 |  |  |  | 7,810 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 14,692,308 |  |  | $ | 14,719,452 |  |  | $ | 13,702,340 |  |  | $ | 13,754,028 |
Short-term borrowings |  |  | 25,683 |  |  |  | 25,683 |  |  |  | — |  |  |  | — |
Advances from Federal Home Loan Bank |  |  | 670,000 |  |  |  | 674,530 |  |  |  | 530,000 |  |  |  | 529,500 |
Other borrowings |  |  | 36,666 |  |  |  | 30,764 |  |  |  | 35,756 |  |  |  | 34,031 |
Long-term debt |  |  | 119,136 |  |  |  | 76,058 |  |  |  | 189,448 |  |  |  | 132,615 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 908 |  |  | $ | 7 |  |  | $ | 1,215 |  |  | $ | 6 |
Foreign exchange contracts |  |  | 127,003 |  |  |  | 1,415 |  |  |  | 94,977 |  |  |  | 1,763 |
Interest rate swaps |  |  | 602,291 |  |  |  | 14,229 |  |  |  | 265,166 |  |  |  | 1,543 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 3,077,081 |  |  | $ | (9,826 | ) |  | $ | 2,691,579 |  |  | $ | (8,843 | )
Standby letters of credit |  |  | 282,352 |  |  |  | (2,431 | ) |  |  | 245,087 |  |  |  | (2,662 | )
Other letters of credit |  |  | 22,209 |  |  |  | (20 | ) |  |  | 35,759 |  |  |  | (30 | )
Bill of lading guarantees |  |  | 319 |  |  |  | (1 | ) |  |  | 730 |  |  |  | — |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2019 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 177,240 |  |  | $ | 177,240 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 416,538 |  |  |  | 416,538 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,451,842 |  |  |  | 74,936 |  |  |  | 1,376,906 |  |  |  | — |
Loans, net (1) |  |  | 15,444,752 |  |  |  | — |  |  |  | — |  |  |  | 15,444,752 |
Equity securities |  |  | 28,005 |  |  |  | 28,005 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 18,090 |  |  |  | — |  |  |  | 18,090 |  |  |  | — |
Warrants |  |  | 39 |  |  |  | — |  |  |  | — |  |  |  | 39 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 14,719,452 |  |  |  | — |  |  |  | — |  |  |  | 14,719,452 |
Short-term borrowings |  |  | 25,683 |  |  |  | — |  |  |  | — |  |  |  | 25,683 |
Advances from Federal Home Loan Bank |  |  | 674,530 |  |  |  | — |  |  |  | 674,530 |  |  |  | — |
Other borrowings |  |  | 30,764 |  |  |  | — |  |  |  | — |  |  |  | 30,764 |
Long-term debt |  |  | 76,058 |  |  |  | — |  |  |  | 76,058 |  |  |  | — |
|  | 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 |  |  |  | — |

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