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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of components of other comprehensive income (loss) | The following tables present the components of other comprehensive income (loss) ("AOCI") for the three months ended March 31, 2023 and 2022, by component:
(dollars in thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2023 |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |
Net unrealized gains on AFS investment securities arising during the period |  | $ | 15,258 |  |  | $ | 4,052 |  |  | $ | 11,206 |
Less: Amortization of unrealized losses on investment securities transferred to HTM |  | 1,668 |  |  | 443 |  |  | 1,225 |
Net change in fair value of investment securities |  | 16,926 |  |  | 4,495 |  |  | 12,431 |
Net change in fair value of derivatives: |  |  |  |  |  |
Net unrealized losses arising during the period |  | (1,599) |  |  | (436) |  |  | (1,163) |
Net change in fair value of derivatives |  | (1,599) |  |  | (436) |  |  | (1,163) |
SERPs: |  |  |  |  |  |
Amortization of net actuarial loss |  | (19) |  |  | (5) |  |  | (14) |
Amortization of net transition obligation |  | 2 |  |  | — |  |  | 2 |
SERPs |  | (17) |  |  | (5) |  |  | (12) |
Other comprehensive income |  | $ | 15,310 |  |  | $ | 4,054 |  |  | $ | 11,256 |
(dollars in thousands) |  | Before Tax |  | Tax Effect |  | Net of Tax
Three Months Ended March 31, 2022 |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |
Net unrealized losses on AFS investment securities arising during the period |  | $ | (108,448) |  |  | $ | (28,998) |  |  | $ | (79,450) |
Net change in fair value of investment securities |  | (108,448) |  |  | (28,998) |  |  | (79,450) |
Net change in fair value of derivatives: |  |  |  |  |  |
Net unrealized losses arising during the period |  | $ | (50) |  |  | $ | (13) |  |  | $ | (37) |
Net change in fair value of derivatives |  | (50) |  |  | (13) |  |  | (37) |
Defined benefit retirement plan and SERPs: |  |  |  |  |  |
Amortization of net actuarial loss |  | 133 |  |  | 36 |  |  | 97 |
Amortization of net transition obligation |  | 4 |  |  | 1 |  |  | 3 |
Defined benefit retirement plan and SERPs |  | 137 |  |  | 37 |  |  | 100 |
Other comprehensive loss |  | $ | (108,361) |  |  | $ | (28,974) |  |  | $ | (79,387) |
Schedule of changes in each component of AOCI, net of tax | The following tables present the changes in each component of AOCI, net of tax, for the three months ended March 31, 2023 and 2022:
(dollars in thousands) |  | Investment Securities |  | Derivatives |  | SERPs [1] |  | AOCI
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (149,109) |  |  | $ | 4,645 |  |  | $ | 480 |  |  | $ | (143,984) |
Other comprehensive income (loss) before reclassifications |  | 11,206 |  |  | (1,163) |  |  | — |  |  | 10,043 |
Reclassification adjustments from AOCI |  | 1,225 |  |  | — |  |  | (12) |  |  | 1,213 |
Total other comprehensive income (loss) |  | 12,431 |  |  | (1,163) |  |  | (12) |  |  | 11,256 |
Balance at end of period |  | $ | (136,678) |  |  | $ | 3,482 |  |  | $ | 468 |  |  | $ | (132,728) |
(dollars in thousands) |  | Investment Securities |  | Derivatives |  | Defined Benefit Retirement Plan and SERPs [1] |  | AOCI
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (3,666) |  |  | $ | — |  |  | $ | (4,294) |  |  | $ | (7,960) |
Other comprehensive loss before reclassifications |  | (79,450) |  |  | (37) |  |  | — |  |  | (79,487) |
Reclassification adjustments from AOCI |  | — |  |  | — |  |  | 100 |  |  | 100 |
Total other comprehensive (loss) income |  | (79,450) |  |  | (37) |  |  | 100 |  |  | (79,387) |
Balance at end of period |  | $ | (83,116) |  |  | $ | (37) |  |  | $ | (4,194) |  |  | $ | (87,347) |
[1] During the second quarter of 2022, the Company settled all obligations related to its defined benefit retirement plan. As a result, all subsequent activity in the Company's AOCI balance related to the defined benefit retirement plan and SERPs relates entirely to SERPs.
Schedule of amounts reclassified out of each component of AOCI | The following table presents the amounts reclassified out of each component of AOCI for the three months ended March 31, 2023 and 2022:
|  | Amount Reclassified from AOCI |  | Affected Line Item in the Statement Where Net Income is Presented
(dollars in thousands) |  | Three Months Ended March 31, |
Details about AOCI Components |  | 2023 |  | 2022 |
Amortization of unrealized losses on investment securities transferred to held-to-maturity: |  |  |  |  |  |
Amortization |  | $ | (1,668) |  |  | $ | — |  |  | Interest and dividends on investment securities
Tax effect |  | 443 |  |  | — |  |  | Income tax expense
Net of tax |  | $ | (1,225) |  |  | $ | — |  |  |
Defined benefit retirement and supplemental executive retirement plan items: |  |  |  |  |  |
Amortization of net actuarial gain (loss) |  | $ | 19 |  |  | $ | (133) |  |  | Other operating expense - other
Amortization of net transition obligation |  | (2) |  |  | (4) |  |  | Other operating expense - other
Total before tax |  | 17 |  |  | (137) |  |  |
Tax effect |  | (5) |  |  | 37 |  |  | Income tax benefit (expense)
Net of tax |  | $ | 12 |  |  | $ | (100) |  |  |
Total reclassification adjustments from AOCI for the period, net of tax |  | $ | (1,213) |  |  | $ | (100) |  |  |

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