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Supplemental Comprehensive Income Disclosures (Tables)
 12 Months Ended
Dec. 31, 2022
Supplemental Comprehensive Income Disclosures [Abstract]  
Schedule of Amounts Recognized in Accumulated Other Comprehensive Income
The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities gains” line in the Consolidated Statements of Income.
202220212020
Pretax AmountTax (Expense) BenefitNet of Tax AmountPretax AmountTax (Expense) BenefitNet of Tax AmountPretax AmountTax (Expense) BenefitNet of Tax Amount
(dollars in thousands)
Unrealized gains (losses) on securities:
Unrealized holding (losses) gains on securities arising during the period$(131,838)$27,686 $(104,152)$(29,892)$6,278 $(23,614)$19,981 $(4,196)$15,785 
Reclassification adjustment for gains on securities included in net income(2)— (2)(16)3 (13)(70)15 (55)
Total unrealized (losses) gains on securities(131,840)27,686 (104,154)(29,908)6,281 (23,627)19,911 (4,181)15,730 
Unrealized gains (losses) on derivatives:
Unrealized holding losses on derivatives arising during the period(31,573)6,630 (24,943)(3,356)705 (2,651)(4,467)938 (3,529)
Total unrealized losses on derivatives(31,573)6,630 (24,943)(3,356)705 (2,651)(4,467)938 (3,529)
Unrealized gains (losses) for postretirement obligations:
Prior service cost76 (16)60 76 (16)60 (537)113 (424)
Net gain (loss)143 (30)113 275 (58)217 (155)32 (123)
Total unrealized gains (losses) for postretirement obligations219 (46)173 351 (74)277 (692)145 (547)
Total other comprehensive (loss) income$(163,194)$34,270 $(128,924)$(32,913)$6,912 $(26,001)$14,752 $(3,098)$11,654 
The following table sets forth the amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit costs as of December 31:
202220212020
 (dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
Net (gain) loss$(575)$(461)$(243)
Prior service cost305 364 424 
Total$(270)$(97)$181 
Related Tax Effects Allocated to Each Component of Other Comprehensive Income
The following table details the change in components of OCI for the year ended December 31:
2022
 Securities Available for SaleDerivativesPost-Retirement ObligationAccumulated Other Comprehensive Income
 (dollars in thousands)
Balance at January 1$(3,317)$(5,546)$95 $(8,768)
Other comprehensive loss before reclassification adjustment(104,152)(24,943)(129,095)
Amounts reclassified from accumulated other comprehensive income (loss)(2)— (2)
Prior service cost60 60 
Net gain113 113 
Net other comprehensive loss during the period(104,154)(24,943)173 (128,924)
Balance at December 31$(107,471)$(30,489)$268 $(137,692)
2021
Securities Available for SaleDerivativesPost-Retirement ObligationAccumulated Other Comprehensive Income
(dollars in thousands)
Balance at January 1$20,310 $(2,895)$(182)$17,233 
Other comprehensive income before reclassification adjustment(23,614)(2,651)(26,265)
Amounts reclassified from accumulated other comprehensive income (loss)(13)— (13)
Prior service cost60 60 
Net gain217 217 
Net other comprehensive income during the period(23,627)(2,651)277 (26,001)
Balance at December 31$(3,317)$(5,546)$95 $(8,768)
2020
Securities Available for SaleDerivativesPost-Retirement ObligationAccumulated Other Comprehensive Income
(dollars in thousands)
Balance at January 1$4,580 $634 $365 $5,579 
Other comprehensive income before reclassification adjustment15,785 (3,529)12,256 
Amounts reclassified from accumulated other comprehensive income (loss)(55)— (55)
Prior service cost(424)(424)
Net gain(123)(123)
Net other comprehensive income during the period15,730 (3,529)(547)11,654 
Balance at December 31$20,310 $(2,895)$(182)$17,233