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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]    
Net income $ 26,074 $ 19,679
Available-for-sale debt securities:    
Change in net unrealized gain (loss) during the period (7,162) 16,117
Employee benefit plans:    
Amortization of net retirement plan actuarial loss 82 128
Amortization of net retirement plan prior service cost 36 37
Other comprehensive income (loss) (7,044) 16,282
Total comprehensive income $ 19,030 $ 35,961