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Note 17 - Fair Value Measurements and Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
As of December 31, 2022 |  | 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 |  | $ | 240,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 240,500 |
U.S. government agency entities |  |  | — |  |  |  | 63,610 |  |  |  | — |  |  |  | 63,610 |
U.S. government sponsored entities |  |  | — |  |  |  | 30,000 |  |  |  | — |  |  |  | 30,000 |
Mortgage-backed securities |  |  | — |  |  |  | 867,094 |  |  |  | — |  |  |  | 867,094 |
Collateralized mortgage obligations |  |  | — |  |  |  | 31,061 |  |  |  | — |  |  |  | 31,061 |
Corporate debt securities |  |  | — |  |  |  | 241,083 |  |  |  | — |  |  |  | 241,083 |
Total securities available-for-sale |  |  | 240,500 |  |  |  | 1,232,848 |  |  |  | — |  |  |  | 1,473,348 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 5,509 |  |  |  | — |  |  |  | — |  |  |  | 5,509 |
Preferred stock of government sponsored entities |  |  | 1,289 |  |  |  | — |  |  |  | — |  |  |  | 1,289 |
Other equity securities |  |  | 15,360 |  |  |  | — |  |  |  | — |  |  |  | 15,360 |
Total equity securities |  |  | 22,158 |  |  |  | — |  |  |  | — |  |  |  | 22,158 |
Warrants |  |  | — |  |  |  | — |  |  |  | 50 |  |  |  | 50 |
Interest rate swaps |  |  | — |  |  |  | 44,443 |  |  |  | — |  |  |  | 44,443 |
Foreign exchange contracts |  |  | — |  |  |  | 448 |  |  |  | — |  |  |  | 448 |
Total assets |  | $ | 262,658 |  |  | $ | 1,277,739 |  |  | $ | 50 |  |  | $ | 1,540,447 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 51,864 |  |  | $ | — |  |  | $ | 51,864 |
Foreign exchange contracts |  |  | — |  |  |  | 942 |  |  |  | — |  |  |  | 942 |
Total liabilities |  | $ | — |  |  | $ | 52,806 |  |  | $ | — |  |  | $ | 52,806 |
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 |
Fair Value Measurements, Nonrecurring [Table Text Block] |
|  | As of December 31, 2022 |  |  | Total Losses |
|  | Fair Value Measurements Using |  |  | Total at |  |  | For the Twelve Months Ended |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Fair Value |  |  | December 31, 2022 |  |  | December 31, 2021 |
Assets |  | (In thousands) |
Non-accrual loans by type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial loans |  | $ | — |  |  | $ | — |  |  | $ | 12,950 |  |  | $ | 12,950 |  |  | $ | 1,786 |  |  | $ | 1,012 |
Commercial mortgage loans |  |  | — |  |  |  | — |  |  |  | 32,205 |  |  |  | 32,205 |  |  |  | 2,091 |  |  |  | — |
Residential mortgage and equity lines |  |  | — |  |  |  | — |  |  |  | 8,978 |  |  |  | 8,978 |  |  |  | — |  |  |  | — |
Installment and other loans |  |  | — |  |  |  | — |  |  |  | 8 |  |  |  | 8 |  |  |  | — |  |  |  | — |
Total non-accrual loans |  |  | — |  |  |  | — |  |  |  | 54,141 |  |  |  | 54,141 |  |  |  | 3,877 |  |  |  | 1,012 |
Other real estate owned (1) |  |  | — |  |  |  | — |  |  |  | 4,328 |  |  |  | 4,328 |  |  |  | — |  |  |  | 17 |
Investments in venture capital |  |  | — |  |  |  | — |  |  |  | 689 |  |  |  | 689 |  |  |  | 268 |  |  |  | 143 |
Total assets |  | $ | — |  |  | $ | — |  |  | $ | 59,158 |  |  | $ | 59,158 |  |  | $ | 4,145 |  |  | $ | 1,172 |
|  | As of December 31, 2021 |  |  | Total Losses/(Gains) |
|  | 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) |
Non-accrual 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 non-accrual 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 |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | December 31, 2022 |  |  | December 31, 2021 |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 195,440 |  |  | $ | 195,440 |  |  | $ | 134,141 |  |  | $ | 134,141 |
Short-term investments |  |  | 966,962 |  |  |  | 966,962 |  |  |  | 2,315,563 |  |  |  | 2,315,563 |
Securities available-for-sale |  |  | 1,473,348 |  |  |  | 1,473,348 |  |  |  | 1,127,309 |  |  |  | 1,127,309 |
Loans, net |  |  | 18,100,898 |  |  |  | 17,944,588 |  |  |  | 16,202,001 |  |  |  | 16,499,869 |
Equity securities |  |  | 22,158 |  |  |  | 22,158 |  |  |  | 22,319 |  |  |  | 22,319 |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |  |  |  | 17,250 |
Warrants |  |  | 50 |  |  |  | 50 |  |  |  | 23 |  |  |  | 23 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Foreign exchange contracts |  | $ | 72,996 |  |  | $ | 448 |  |  | $ | 181,997 |  |  | $ | 1,113 |
Interest rate swaps |  |  | 817,615 |  |  |  | 44,443 |  |  |  | 904,635 |  |  |  | 10,090 |
Financial Liabilities |  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Deposits |  | $ | 18,505,279 |  |  | $ | 18,572,387 |  |  | $ | 18,058,842 |  |  | $ | 18,051,720 |
Advances from Federal Home Loan Bank |  |  | 485,000 |  |  |  | 482,737 |  |  |  | 20,000 |  |  |  | 21,279 |
Other borrowings |  |  | 22,600 |  |  |  | 18,385 |  |  |  | 23,145 |  |  |  | 18,945 |
Long-term debt |  |  | 119,136 |  |  |  | 68,231 |  |  |  | 119,136 |  |  |  | 62,274 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Option contracts |  | $ | — |  |  | $ | — |  |  | $ | 676 |  |  | $ | 3 |
Foreign exchange contracts |  |  | 170,213 |  |  |  | 942 |  |  |  | 51,782 |  |  |  | 327 |
Interest rate swaps |  |  | 595,426 |  |  |  | 51,864 |  |  |  | 872,400 |  |  |  | 12,642 |
|  | Notional |  |  |  |  |  |  | Notional |  |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
Off-Balance Sheet Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to extend credit |  | $ | 3,630,304 |  |  | $ | (14,797 | ) |  | $ | 3,297,362 |  |  | $ | (12,594 | )
Standby letters of credit |  |  | 315,821 |  |  |  | (2,738 | ) |  |  | 266,490 |  |  |  | (2,640 | )
Other letters of credit |  |  | 29,416 |  |  |  | (33 | ) |  |  | 16,652 |  |  |  | (13 | )
Bill of lading guarantees |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule Of Fair Value Of Financial Instruments [Table Text Block] |
|  | As of December 31, 2022 |
|  | Estimated |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Measurements |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | (In thousands) |
Financial Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and due from banks |  | $ | 195,440 |  |  | $ | 195,440 |  |  | $ | — |  |  | $ | — |
Short-term investments |  |  | 966,962 |  |  |  | 966,962 |  |  |  | — |  |  |  | — |
Securities available-for-sale |  |  | 1,473,348 |  |  |  | 240,500 |  |  |  | 1,232,848 |  |  |  | — |
Loans, net |  |  | 17,944,588 |  |  |  | — |  |  |  | — |  |  |  | 17,944,588 |
Equity securities |  |  | 22,158 |  |  |  | 22,158 |  |  |  | — |  |  |  | — |
Investment in Federal Home Loan Bank stock |  |  | 17,250 |  |  |  | — |  |  |  | 17,250 |  |  |  | — |
Warrants |  |  | 50 |  |  |  | — |  |  |  | — |  |  |  | 50 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits |  |  | 18,572,387 |  |  |  | — |  |  |  | — |  |  |  | 18,572,387 |
Advances from Federal Home Loan Bank |  |  | 482,737 |  |  |  | — |  |  |  | 482,737 |  |  |  | — |
Other borrowings |  |  | 18,385 |  |  |  | — |  |  |  | — |  |  |  | 18,385 |
Long-term debt |  |  | 68,231 |  |  |  | — |  |  |  | 68,231 |  |  |  | — |
|  | 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 |  |  |  | — |

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