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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (138,110) $ (125,589) $ (127,087) $ (139,974)
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities 3,535 (15,808) (7,561) (1,570)
Amount reclassified from accumulated other comprehensive income, unrealized gains and losses on available for-sale-Securities 74 147 147 294
Net current period other comprehensive income (loss) 3,609 (15,661) (7,414) (1,276)
Ending balance (134,501) (141,250) (134,501) (141,250)
Unrealized gains and (Losses) on available- for-sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (129,096) (114,658) (118,000) (128,896)
Change in Other comprehensive income (loss) before reclassification, Unrealized gains and Losses on available-for-sale Securities 3,535 (15,808) (7,561) (1,570)
Net current period other comprehensive income (loss) 3,535 (15,808) (7,561) (1,570)
Ending balance (125,561) (130,466) (125,561) (130,466)
Retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (9,014) (10,931) (9,087) (11,078)
Amount reclassified from accumulated other comprehensive income, unrealized gains and losses on available for-sale-Securities 74 147 147 294
Net current period other comprehensive income (loss) 74 147 147 294
Ending balance $ (8,940) $ (10,784) $ (8,940) $ (10,784)