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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Schedule of AOCI | The following table summarizes the changes within each classification of AOCI, net of tax:
(dollars in thousands) | Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension Plans |  | Total
Three Months Ended March 31, 2021 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 145,335 |  |  |  |  | $ | 2,584 |  |  | $ | (148) |  |  | $ | 147,771 |
Other comprehensive income (loss) before reclassifications | (57,287) |  |  |  |  | 3,053 |  |  | — |  |  | (54,234) |
Amounts reclassified from AOCI to income (1) | (1,553) |  |  |  |  | (112) |  |  | 37 |  |  | (1,628) |
Balance at end of period | $ | 86,495 |  |  |  |  | $ | 5,525 |  |  | $ | (111) |  |  | $ | 91,909 |
Three Months Ended March 31, 2020 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 56,131 |  |  |  |  | $ | 240 |  |  | $ | (164) |  |  | $ | 56,207 |
Other comprehensive income (loss) before reclassifications | 80,369 |  |  |  |  | 5,886 |  |  | — |  |  | 86,255 |
Amounts reclassified from AOCI to income (1) | (4,000) |  |  |  |  | (325) |  |  | 20 |  |  | (4,305) |
Balance at end of period | $ | 132,500 |  |  |  |  | $ | 5,801 |  |  | $ | (144) |  |  | $ | 138,157 |
(1)See table below for details about reclassifications to income.
Reclassifications out of AOCI | The following table summarizes the significant amounts reclassified out of each component of AOCI for the three months ended March 31, 2021 and 2020:
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
| Three Months Ended March 31, |  |
(dollars in thousands) | 2021 |  | 2020 |  |
Unrealized gains and losses on available-for-sale debt securities | $ | 1,993 |  |  | $ | 5,174 |  |  | Debt securities gains (losses), net
| (440) |  |  | (1,174) |  |  | Income tax (expense) benefit
| $ | 1,553 |  |  | $ | 4,000 |  |  | Net income
Gains and losses on cash flow hedges Interest rate contracts | $ | 149 |  |  | $ | 431 |  |  | Interest income (expense)
| (37) |  |  | (106) |  |  | Income tax (expense) benefit
| $ | 112 |  |  | $ | 325 |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |
Actuarial gains (losses) | $ | (49) |  |  | $ | (27) |  |  | Salaries and employee benefits
| 12 |  |  | 7 |  |  | Income tax (expense) benefit
| $ | (37) |  |  | $ | (20) |  |  | Net income
Total reclassifications for the period | $ | 1,628 |  |  | $ | 4,305 |  |  | Net income

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