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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, 2021
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2021 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Assets |  | (In thousands) |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
U.S. government agency entities |  |  | — |  |  |  | 87,509 |  |  |  | — |  |  |  | 87,509 |
Mortgage-backed securities |  |  | — |  |  |  | 888,665 |  |  |  | — |  |  |  | 888,665 |
Collateralized mortgage obligations |  |  | — |  |  |  | 9,117 |  |  |  | — |  |  |  | 9,117 |
Corporate debt securities |  |  | — |  |  |  | 142,018 |  |  |  | — |  |  |  | 142,018 |
Total securities available-for-sale |  |  | — |  |  |  | 1,127,309 |  |  |  | — |  |  |  | 1,127,309 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 6,230 |  |  |  | — |  |  |  | — |  |  |  | 6,230 |
Preferred stock of government sponsored entities |  |  | 1,811 |  |  |  | — |  |  |  | — |  |  |  | 1,811 |
Other equity securities |  |  | 14,278 |  |  |  | — |  |  |  | — |  |  |  | 14,278 |
Total equity securities |  |  | 22,319 |  |  |  | — |  |  |  | — |  |  |  | 22,319 |
Warrants |  |  | — |  |  |  | — |  |  |  | 23 |  |  |  | 23 |
Interest rate swaps |  |  | — |  |  |  | 10,090 |  |  |  | — |  |  |  | 10,090 |
Foreign exchange contracts |  |  | — |  |  |  | 1,113 |  |  |  | — |  |  |  | 1,113 |
Total assets |  | $ | 22,319 |  |  | $ | 1,138,512 |  |  | $ | 23 |  |  | $ | 1,160,854 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 12,642 |  |  | $ | — |  |  | $ | 12,642 |
Foreign exchange contracts |  |  | — |  |  |  | 327 |  |  |  | — |  |  |  | 327 |
Total liabilities |  | $ | — |  |  | $ | 12,969 |  |  | $ | — |  |  | $ | 12,969 |
As of December 31, 2020 |  | Fair Value Measurements Using |  |  | Total at |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |
Assets |  | (In thousands) |
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 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | As of December 31, 2021 |  |  | Total Losses |
|  | Fair Value Measurements Using |  |  | Total at |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | December 31, 2021 |  |  | December 31, 2020 |
Assets |  | (In thousands) |
Impaired loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 4,327 |  |  | $ | 4,327 |  |  | $ | 1,012 |  |  | $ | 7,012 |
Commercial mortgage loans |  |  | — |  |  |  | — |  |  |  | 13,335 |  |  |  | 13,335 |  |  |  | — |  |  |  | — |
Residential mortgage and equity lines |  |  | — |  |  |  | — |  |  |  | 5,243 |  |  |  | 5,243 |  |  |  | — |  |  |  | — |
Total impaired loans |  |  | — |  |  |  | — |  |  |  | 22,905 |  |  |  | 22,905 |  |  |  | 1,012 |  |  |  | 7,012 |
Other real estate owned (1) |  |  | — |  |  |  | — |  |  |  | 4,589 |  |  |  | 4,589 |  |  |  | 17 |  |  |  | 717 |
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 952 |  |  |  | 952 |  |  |  | 143 |  |  |  | 107 |
Total assets |  | $ | — |  |  | $ | — |  |  | $ | 28,446 |  |  | $ | 28,446 |  |  | $ | 1,172 |  |  | $ | 7,836 |
|  | As of December 31, 2020 |  |  | Total Losses/(Gains) |
|  | Fair Value Measurements Using |  |  | Total at |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | December 31, 2020 |  |  | December 31, 2019 |
Assets |  | (In thousands) |
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 |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2021 |  |  | December 31, 2020 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 134,141 |  |  | $ | 134,141 |  |  | $ | 138,616 |  |  | $ | 138,616 |
Short-term investments |  |  | 2,315,563 |  |  |  | 2,315,563 |  |  |  | 1,282,462 |  |  |  | 1,282,462 |
Securities available-for-sale |  |  | 1,127,309 |  |  |  | 1,127,309 |  |  |  | 1,036,550 |  |  |  | 1,036,550 |
Loans, net |  |  | 16,202,001 |  |  |  | 16,499,869 |  |  |  | 15,475,364 |  |  |  | 16,103,471 |
Equity securities |  |  | 22,319 |  |  |  | 22,319 |  |  |  | 23,744 |  |  |  | 23,744 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 23 |  |  |  | 23 |  |  |  | 21 |  |  |  | 21 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 181,997 |  |  | $ | 1,113 |  |  | $ | 151,244 |  |  | $ | 4,658 |
Interest rate swaps |  |  | 904,635 |  |  |  | 10,090 |  |  |  | 96,889 |  |  |  | 3,409 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 18,058,842 |  |  | $ | 18,051,720 |  |  | $ | 16,109,401 |  |  | $ | 16,125,808 |
Advances from Federal Home Loan Bank |  |  | 20,000 |  |  |  | 21,279 |  |  |  | 150,000 |  |  |  | 155,133 |
Other borrowings |  |  | 23,145 |  |  |  | 18,945 |  |  |  | 23,714 |  |  |  | 19,632 |
Long-term debt |  |  | 119,136 |  |  |  | 62,274 |  |  |  | 119,136 |  |  |  | 65,487 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | 676 |  |  | $ | 2,911 |  |  | $ | — |  |  | $ | — |
Foreign exchange contracts |  |  | 51,782 |  |  |  | 327 |  |  |  | 132,813 |  |  |  | 2,200 |
Interest rate swaps |  |  | 872,400 |  |  |  | 12,642 |  |  |  | 679,648 |  |  |  | 10,286 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 3,297,362 |  |  | $ | (12,594 | ) |  | $ | 2,977,528 |  |  | $ | (8,432 | )
Standby letters of credit |  |  | 266,490 |  |  |  | (2,640 | ) |  |  | 234,200 |  |  |  | (1,630 | )
Other letters of credit |  |  | 16,652 |  |  |  | (13 | ) |  |  | 16,821 |  |  |  | (16 | )
Bill of lading guarantees |  |  | — |  |  |  | — |  |  |  | 238 |  |  |  | — |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2021 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 134,141 |  |  | $ | 134,141 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 2,315,563 |  |  |  | 2,315,563 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,127,309 |  |  |  | — |  |  |  | 1,127,309 |  |  |  | — |
Loans, net |  |  | 16,499,869 |  |  |  | — |  |  |  | — |  |  |  | 16,499,869 |
Equity securities |  |  | 22,319 |  |  |  | 22,319 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Warrants |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 23 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 18,051,720 |  |  |  | — |  |  |  | — |  |  |  | 18,051,720 |
Advances from Federal Home Loan Bank |  |  | 21,279 |  |  |  | — |  |  |  | 21,279 |  |  |  | — |
Other borrowings |  |  | 18,945 |  |  |  | — |  |  |  | — |  |  |  | 18,945 |
Long-term debt |  |  | 62,274 |  |  |  | — |  |  |  | 62,274 |  |  |  | — |
|  | 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 (1) |  |  | 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 |  |  |  | — |

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