v3.26.1
Other Comprehensive Income (Loss) - Schedule of Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Before-Tax Amount        
Net unrealized /losses /gains / Other comprehensive (loss) income $ (7,946) $ 9,460 $ (17,337) $ 31,169
Tax (Expense) Benefit        
Other comprehensive income (loss), net unrealized loss 1,988 (2,365) 4,335 (7,792)
Net of Tax        
Other comprehensive gain (loss), before reclassifications (5,976) 7,044 (13,138) 23,161
Reclassification adjustment 18 51 136 216
Other comprehensive (loss) income (5,958) 7,095 (13,002) 23,377
Available-for-sale securities        
Before-Tax Amount        
Change in net unrealized (loss) gain during the period (7,968) 9,392 (17,517) 30,881
Net unrealized /losses /gains / Other comprehensive (loss) income (7,968) 9,392 (17,517) 30,881
Tax (Expense) Benefit        
Change in net unrealized (loss) gain during the period 1,992 (2,348) 4,379 (7,720)
Other comprehensive income (loss), net unrealized loss 1,992 (2,348) 4,379 (7,720)
Net of Tax        
Other comprehensive gain (loss), before reclassifications (5,976) 7,044 (13,138) 23,161
Other comprehensive (loss) income (5,976) 7,044 (13,138) 23,161
Amortization of net retirement plan actuarial gain (loss)        
Before-Tax Amount        
Reclassification adjustment (26) 19 83 190
Tax (Expense) Benefit        
Reclassification adjustment 7 (5) (20) (48)
Net of Tax        
Reclassification adjustment (19) 14 63 142
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment 48 49 97 98
Tax (Expense) Benefit        
Reclassification adjustment (11) (12) (24) (24)
Net of Tax        
Reclassification adjustment 37 37 73 74
Employee benefit plans        
Before-Tax Amount        
Net unrealized /losses /gains / Other comprehensive (loss) income 22 68 180 288
Tax (Expense) Benefit        
Other comprehensive income (loss), net unrealized loss (4) (17) (44) (72)
Net of Tax        
Other comprehensive (loss) income $ 18 $ 51 $ 136 $ 216