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Supplemental Comprehensive Income Disclosures
9 Months Ended
Sep. 30, 2023
Supplemental Comprehensive Income Disclosures [Abstract]  
Comprehensive Income (Loss) Note Supplemental Comprehensive Income DisclosuresThe following table identifies the related tax effects allocated to each component of other comprehensive income (“OCI”) in the unaudited Consolidated Statements of Comprehensive Income. Reclassification adjustments related to securities available for sale are included in the "Net securities gains" line in the unaudited Consolidated Statements of Income.
For the Nine Months Ended September 30,
20232022
Pretax AmountTax (Expense) BenefitNet of Tax AmountPretax AmountTax (Expense) BenefitNet of Tax Amount
(dollars in thousands)
Unrealized losses on securities:
Unrealized holding losses on securities arising during the period$(25,150)$5,282 $(19,868)$(135,258)$28,405 $(106,853)
Reclassification adjustment for losses (gains) on securities included in net income103 (22)81 (2)— (2)
Total unrealized losses on securities(25,047)5,260 (19,787)(135,260)28,405 (106,855)
Unrealized gains (losses) on derivatives:
Unrealized holding gains (losses) on derivatives arising during the period4,336 (911)3,425 (33,754)7,088 (26,666)
Total unrealized gains (losses) on derivatives4,336 (911)3,425 (33,754)7,088 (26,666)
Total other comprehensive loss$(20,711)$4,349 $(16,362)$(169,014)$35,493 $(133,521)
For the Three Months Ended September 30,
20232022
Pretax AmountTax (Expense) BenefitNet of Tax AmountPretax AmountTax (Expense) BenefitNet of Tax Amount
(dollars in thousands)
Unrealized losses on securities:
Unrealized holding losses on securities arising during the period$(21,389)$4,138 $(17,251)$(46,213)$9,705 $(36,508)
Reclassification adjustment for losses on securities included in net income103 (22)81 — — — 
Total unrealized losses on securities(21,286)4,116 (17,170)(46,213)9,705 (36,508)
Unrealized gains (losses) on derivatives:
Unrealized holding gains (losses) on derivatives arising during the period2,111 (444)1,667 (11,083)2,327 (8,756)
Total unrealized gains (losses) on derivatives2,111 (444)1,667 (11,083)2,327 (8,756)
Total other comprehensive loss$(19,175)$3,672 $(15,503)$(57,296)$12,032 $(45,264)
The following table details the change in components of OCI for the nine months ended September 30:
20232022
 Securities Available for SalePost-Retirement ObligationDerivativesAccumulated Other Comprehensive Income (Loss)Securities Available for SalePost-Retirement ObligationDerivativesAccumulated Other Comprehensive Income (Loss)
 (dollars in thousands)
Balance at December 31$(107,471)$268 $(30,489)$(137,692)$(3,317)$95 $(5,546)$(8,768)
Other comprehensive loss before reclassification adjustment(19,868)— 3,425 (16,443)(106,853)— (26,666)(133,519)
Amounts reclassified from accumulated other comprehensive (loss) income81 — — 81 (2)— — (2)
Net other comprehensive loss during the period(19,787)— 3,425 (16,362)(106,855)— (26,666)(133,521)
Balance at September 30$(127,258)$268 $(27,064)$(154,054)$(110,172)$95 $(32,212)$(142,289)
The following table details the change in components of OCI for the three months ended September 30:

20232022
 Securities Available for SalePost-Retirement ObligationDerivativesAccumulated Other Comprehensive Income (Loss)Securities Available for SalePost-Retirement ObligationDerivativesAccumulated Other Comprehensive Income (Loss)
 (dollars in thousands)
Balance at June 30$(110,088)$268 $(28,731)$(138,551)$(73,664)$95 $(23,456)$(97,025)
Other comprehensive loss before reclassification adjustment(17,251)— 1,667 (15,584)(36,508)— (8,756)(45,264)
Amounts reclassified from accumulated other comprehensive (loss) income81 — — 81 — — — — 
Net other comprehensive loss during the period(17,170)— 1,667 (15,503)(36,508)— (8,756)(45,264)
Balance at September 30$(127,258)$268 $(27,064)$(154,054)$(110,172)$95 $(32,212)$(142,289)