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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2020 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
|  | (In thousands) |
Assets |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 80,948 |  |  | $ | — |  |  | $ | — |  |  | $ | 80,948 |
U.S. government agency entities |  |  | — |  |  |  | 99,838 |  |  |  | — |  |  |  | 99,838 |
Mortgage-backed securities |  |  | — |  |  |  | 727,068 |  |  |  | — |  |  |  | 727,068 |
Collateralized mortgage obligations |  |  | — |  |  |  | 10,324 |  |  |  | — |  |  |  | 10,324 |
Corporate debt securities |  |  | — |  |  |  | 118,372 |  |  |  | — |  |  |  | 118,372 |
Total securities available-for-sale |  |  | 80,948 |  |  |  | 955,602 |  |  |  | — |  |  |  | 1,036,550 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 6,413 |  |  |  | — |  |  |  | — |  |  |  | 6,413 |
Preferred stock of government sponsored entities |  |  | 5,485 |  |  |  | — |  |  |  | — |  |  |  | 5,485 |
Other equity securities |  |  | 11,846 |  |  |  | — |  |  |  | — |  |  |  | 11,846 |
Total equity securities |  |  | 23,744 |  |  |  | — |  |  |  | — |  |  |  | 23,744 |
Warrants |  |  | — |  |  |  | — |  |  |  | 21 |  |  |  | 21 |
Interest rate swaps |  |  | — |  |  |  | 3,409 |  |  |  | — |  |  |  | 3,409 |
Foreign exchange contracts |  |  | — |  |  |  | 4,658 |  |  |  | — |  |  |  | 4,658 |
Total assets |  | $ | 104,692 |  |  | $ | 963,669 |  |  | $ | 21 |  |  | $ | 1,068,382 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 10,286 |  |  | $ | — |  |  | $ | 10,286 |
Foreign exchange contracts |  |  | — |  |  |  | 2,200 |  |  |  | — |  |  |  | 2,200 |
Total liabilities |  | $ | — |  |  | $ | 12,486 |  |  | $ | — |  |  | $ | 12,486 |
As of December 31, 2019 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
|  | (In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 74,936 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,936 |
U.S. government agency entities |  |  | — |  |  |  | 90,796 |  |  |  | — |  |  |  | 90,796 |
U.S. government sponsored entities |  |  | — |  |  |  | 224,443 |  |  |  | — |  |  |  | 224,443 |
Mortgage-backed securities |  |  | — |  |  |  | 887,790 |  |  |  | — |  |  |  | 887,790 |
Collateralized mortgage obligations |  |  | — |  |  |  | 552 |  |  |  | — |  |  |  | 552 |
Corporate debt securities |  |  | — |  |  |  | 173,325 |  |  |  | — |  |  |  | 173,325 |
Total securities available-for-sale |  |  | 74,936 |  |  |  | 1,376,906 |  |  |  | — |  |  |  | 1,451,842 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 6,277 |  |  |  | — |  |  |  | — |  |  |  | 6,277 |
Preferred stock of government sponsored entities |  |  | 10,529 |  |  |  | — |  |  |  | — |  |  |  | 10,529 |
Other equity securities |  |  | 11,199 |  |  |  | — |  |  |  | — |  |  |  | 11,199 |
Total equity securities |  |  | 28,005 |  |  |  | — |  |  |  | — |  |  |  | 28,005 |
Warrants |  |  | — |  |  |  | — |  |  |  | 39 |  |  |  | 39 |
Interest rate swaps |  |  | — |  |  |  | 2,181 |  |  |  | — |  |  |  | 2,181 |
Foreign exchange contracts |  |  | — |  |  |  | 2,411 |  |  |  | — |  |  |  | 2,411 |
Total assets |  | $ | 102,941 |  |  | $ | 1,381,498 |  |  | $ | 39 |  |  | $ | 1,484,478 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option contracts |  | $ | — |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Interest rate swaps |  |  | — |  |  |  | 14,229 |  |  |  | — |  |  |  | 14,229 |
Foreign exchange contracts |  |  | — |  |  |  | 1,415 |  |  |  | — |  |  |  | 1,415 |
Total liabilities |  | $ | — |  |  | $ | 15,651 |  |  | $ | — |  |  | $ | 15,651 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | As of December 31, 2020 |  |  | Total Losses |
|  | Fair Value Measurements Using |  |  |  |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total at Fair Value |  |  | December 31, 2020 |  |  | December 31, 2019 |
|  | (In thousands) |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 5,342 |  |  | $ | 5,342 |  |  | $ | 7,012 |  |  | $ | — |
Commercial mortgage loans |  |  | — |  |  |  | — |  |  |  | 25,749 |  |  |  | 25,749 |  |  |  | — |  |  |  | — |
Residential mortgage and equity lines |  |  | — |  |  |  | — |  |  |  | 4,307 |  |  |  | 4,307 |  |  |  | — |  |  |  | — |
Total impaired loans |  |  | — |  |  |  | — |  |  |  | 35,398 |  |  |  | 35,398 |  |  |  | 7,012 |  |  |  | — |
Other real estate owned (1) |  |  | — |  |  |  | 905 |  |  |  | 4,236 |  |  |  | 5,141 |  |  |  | 717 |  |  |  | 681 |
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 1,381 |  |  |  | 1,381 |  |  |  | 107 |  |  |  | 167 |
Total assets |  | $ | — |  |  | $ | 905 |  |  | $ | 41,015 |  |  | $ | 41,920 |  |  | $ | 7,836 |  |  | $ | 848 |
|  | As of December 31, 2019 |  |  | Total Losses/(Gains) |
|  | Fair Value Measurements Using |  |  |  |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total at Fair Value |  |  | December 31, 2019 |  |  | December 31, 2018 |
|  | (In thousands) |
Assets |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 6,196 |  |  | $ | 6,196 |  |  | $ | — |  |  | $ | — |
Commercial mortgage loans |  |  | — |  |  |  | — |  |  |  | 25,566 |  |  |  | 25,566 |  |  |  | — |  |  |  | — |
Residential mortgage and equity lines |  |  | — |  |  |  | — |  |  |  | 5,320 |  |  |  | 5,320 |  |  |  | — |  |  |  | — |
Total impaired loans |  |  | — |  |  |  | — |  |  |  | 37,082 |  |  |  | 37,082 |  |  |  | — |  |  |  | — |
Other real estate owned (1) |  |  | — |  |  |  | 6,490 |  |  |  | 4,343 |  |  |  | 10,833 |  |  |  | 681 |  |  |  | (619 | )
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 1,604 |  |  |  | 1,604 |  |  |  | 167 |  |  |  | 330 |
Total assets |  | $ | — |  |  | $ | 6,490 |  |  | $ | 43,029 |  |  | $ | 49,519 |  |  | $ | 848 |  |  | $ | (289 | )
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 138,616 |  |  | $ | 138,616 |  |  | $ | 177,240 |  |  | $ | 177,240 |
Short-term investments |  |  | 1,282,462 |  |  |  | 1,282,462 |  |  |  | 416,538 |  |  |  | 416,538 |
Securities available-for-sale |  |  | 1,036,550 |  |  |  | 1,036,550 |  |  |  | 1,451,842 |  |  |  | 1,451,842 |
Loans, net |  |  | 15,475,364 |  |  |  | 16,103,471 |  |  |  | 14,951,631 |  |  |  | 15,444,752 |
Equity securities |  |  | 23,744 |  |  |  | 23,744 |  |  |  | 28,005 |  |  |  | 28,005 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 18,090 |  |  |  | 18,090 |
Warrants |  |  | 21 |  |  |  | 21 |  |  |  | 39 |  |  |  | 39 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 151,244 |  |  | $ | 4,658 |  |  | $ | 146,397 |  |  | $ | 2,411 |
Interest rate swaps |  |  | 96,889 |  |  |  | 3,409 |  |  |  | 130,401 |  |  |  | 2,181 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 16,109,401 |  |  | $ | 16,125,808 |  |  | $ | 14,692,308 |  |  | $ | 14,719,452 |
Short-term borrowings |  |  | — |  |  |  | — |  |  |  | 25,683 |  |  |  | 25,683 |
Advances from Federal Home Loan Bank |  |  | 150,000 |  |  |  | 155,133 |  |  |  | 670,000 |  |  |  | 674,530 |
Other borrowings |  |  | 23,714 |  |  |  | 19,632 |  |  |  | 36,666 |  |  |  | 30,764 |
Long-term debt |  |  | 119,136 |  |  |  | 65,487 |  |  |  | 119,136 |  |  |  | 76,058 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | — |  |  | $ | — |  |  | $ | 908 |  |  | $ | 7 |
Foreign exchange contracts |  |  | 132,813 |  |  |  | 2,200 |  |  |  | 127,003 |  |  |  | 1,415 |
Interest rate swaps |  |  | 679,648 |  |  |  | 10,286 |  |  |  | 602,291 |  |  |  | 14,229 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 2,977,528 |  |  | $ | (8,432 | ) |  | $ | 3,077,081 |  |  | $ | (9,826 | )
Standby letters of credit |  |  | 234,200 |  |  |  | (1,630 | ) |  |  | 282,352 |  |  |  | (2,431 | )
Other letters of credit |  |  | 16,821 |  |  |  | (16 | ) |  |  | 22,209 |  |  |  | (20 | )
Bill of lading guarantees |  |  | 238 |  |  |  | — |  |  |  | 319 |  |  |  | (1 | )
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2020 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 138,616 |  |  | $ | 138,616 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 1,282,462 |  |  |  | 1,282,462 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,036,550 |  |  |  | 80,948 |  |  |  | 955,602 |  |  |  | — |
Loans, net |  |  | 16,103,471 |  |  |  | — |  |  |  | — |  |  |  | 16,103,471 |
Equity securities |  |  | 23,744 |  |  |  | 23,744 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Warrants |  |  | 21 |  |  |  | — |  |  |  | — |  |  |  | 21 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 16,125,808 |  |  |  | — |  |  |  | — |  |  |  | 16,125,808 |
Advances from Federal Home Loan Bank |  |  | 155,133 |  |  |  | — |  |  |  | 155,133 |  |  |  | — |
Other borrowings |  |  | 19,632 |  |  |  | — |  |  |  | — |  |  |  | 19,632 |
Long-term debt |  |  | 65,487 |  |  |  | — |  |  |  | 65,487 |  |  |  | — |
|  | 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 |  |  |  | — |

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