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Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
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 $ (32,529) $ 6,214 $ (76,608) $ (10,402)
Reclassification adjustment for net realized gains included in net income, tax 0 0 0 (142)
Derivatives qualifying as cash flow hedges:        
Unrealized interest rate hedging arising during the period, tax 273 (243) 1,319 299
Reclassification adjustment for net unrealized losses included in net income, tax 18 0 37 0
Retirement benefit plans:        
Adjustment for amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, tax 44 2,086 1,606 4,170
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, tax $ 19 $ (2,016) $ (1,481) $ (4,031)