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Note 7 - Comprehensive (Loss) Income (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
Details about Accumulated Other Comprehensive Income Components |  | Amounts Reclassified from Accumulated Other Comprehensive Income |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income |  | Affected Line item in the Consolidated Statements of Income
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |  |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |
Interest income (expense) on cash flow hedges |  | $ | 4,793 |  |  | $ | 1,178 |  |  | $ | 13,013 |  |  | $ | 524 |  | Borrowings and deposits expense
|  |  | (1,442 | ) |  |  | (343 | ) |  |  | (3,915 | ) |  |  | (159 | ) | Income tax (expense) benefit
|  | $ | 3,351 |  |  | $ | 835 |  |  | $ | 9,098 |  |  | $ | 365 |  |
Amortization of pension plan net actuarial losses |  | $ | (74 | ) |  | $ | (17 | ) |  | $ | (222 | ) |  | $ | (49 | ) | Other components of net periodic pension expense
|  |  | 22 |  |  |  | 5 |  |  |  | 67 |  |  |  | 14 |  | Income tax benefit
|  | $ | (52 | ) |  | $ | (12 | ) |  | $ | (155 | ) |  | $ | (35 | ) |
Total reclassification |  | $ | 3,299 |  |  | $ | 823 |  |  | $ | 8,943 |  |  | $ | 330 |  |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | September 30, 2023 |  |  | December 31, 2022 |
|  | (dollars in thousands) |
Investment securities available-for-sale, net of tax |  | $ | (87,748 | ) |  | $ | (61,775 | )
Cash flow hedge, net of tax |  |  | 37,128 |  |  |  | 32,360 |
Defined benefit pension and post-retirement plans, net of tax |  |  | (2,794 | ) |  |  | (2,949 | )
Total |  | $ | (53,414 | ) |  | $ | (32,364 | )

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