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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net unrealized gains (losses) on available-for-sale investment securities:    
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, tax $ (4,975) $ 6,079
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 1,129 1,346
Derivatives qualifying as cash flow hedges:    
Unrealized interest rate hedging arising during the period, tax 256 65
Reclassification adjustment for net unrealized losses included in net income, tax (16) (17)
Retirement benefit plans:    
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, tax (154) (122)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ (159) $ (147)