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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net unrealized gains (losses) on available-for-sale investment securities:        
Net unrealized losses on available-for-sale investment securities arising during the period, tax $ 0 $ (617) $ 0 $ (5,592)
Amortization of unrealized holding losses on held-to-maturity securities, net of taxes 0 1,205 0 2,334
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging gains (losses) arising during the period, tax (80) 11 (215) 267
Reclassification adjustment to net income, tax (18) (18) (35) (34)
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, tax (175) (155) (351) (309)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ 167 $ 160 $ 335 $ 319