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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Before-Tax Amount        
Net unrealized gains/losses $ 9,460 $ (1,129) $ 31,169 $ (14,126)
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive income (loss) (2,365) 275 (7,792) 3,461
Net of Tax        
Change in net unrealized (loss) gain during the period 7,044 (1,051) 23,161 (11,079)
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 51 197 216 414
Other comprehensive income (loss) 7,095 (854) 23,377 (10,665)
Net unrealized gains/losses        
Before-Tax Amount        
Change in net unrealized (loss) gain during the period 9,392 (1,391) 30,881 (14,675)
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 0 0 0
Net unrealized gains/losses 9,392 (1,391) 30,881 (14,675)
Tax (Expense) Benefit        
Change in net unrealized (loss) gain during the period (2,348) 340 (7,720) 3,596
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 0 0 0
Net unrealized gains/losses and Other comprehensive income (loss) (2,348) 340 (7,720) 3,596
Net of Tax        
Change in net unrealized (loss) gain during the period 7,044 (1,051) 23,161 (11,079)
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 0 0 0 0
Other comprehensive income (loss) 7,044 (1,051) 23,161 (11,079)
Amortization of net retirement plan actuarial gain (loss)        
Before-Tax Amount        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 19 215 190 457
Tax (Expense) Benefit        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) (5) (53) (48) (112)
Net of Tax        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 14 162 142 345
Amortization of net retirement plan prior service cost        
Before-Tax Amount        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 49 47 98 92
Tax (Expense) Benefit        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) (12) (12) (24) (23)
Net of Tax        
Reclassification adjustment for net realized gains (loss) on sale of available-for-sale debt securities included in net income (loss) 37 35 74 69
Employee benefit plans        
Before-Tax Amount        
Net unrealized gains/losses 68 262 288 549
Tax (Expense) Benefit        
Net unrealized gains/losses and Other comprehensive income (loss) (17) (65) (72) (135)
Net of Tax        
Other comprehensive income (loss) $ 51 $ 197 $ 216 $ 414