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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 257,069 $ 247,032 $ 245,042 $ 272,114
Unrealized loss on available for sale securities, net of tax (7,033) (19,766) (8,288) (53,382)
Realized losses on securities, net of tax [1],[2] 0 0 556 0
Amortization of unrealized losses on securities previously transferred to held to maturity, net of tax [3] 244 523 731 0
Amortization of pension net loss, transition liability and prior service cost, net of tax [2],[4] 74 79 246 237
TOTAL OTHER COMPREHENSIVE LOSS (6,715) (19,164) (6,755) (53,145)
Ending balance 255,638 232,370 255,638 232,370
Unrealized Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (52,734) (3,474)
Unrealized loss on available for sale securities, net of tax     (8,288) (53,382)
Realized losses on securities, net of tax     556  
Amortization of unrealized losses on securities previously transferred to held to maturity, net of tax     731  
Amortization of pension net loss, transition liability and prior service cost, net of tax     0 0
TOTAL OTHER COMPREHENSIVE LOSS     (7,001) (53,382)
Ending balance (59,735) (56,856) (59,735) (56,856)
Pension Liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (5,278) (6,071)
Unrealized loss on available for sale securities, net of tax     0 0
Realized losses on securities, net of tax     0  
Amortization of unrealized losses on securities previously transferred to held to maturity, net of tax     0  
Amortization of pension net loss, transition liability and prior service cost, net of tax     246 237
TOTAL OTHER COMPREHENSIVE LOSS     246 237
Ending balance (5,032) (5,834) (5,032) (5,834)
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (58,052) (43,526) (58,012) (9,545)
Unrealized loss on available for sale securities, net of tax     (8,288) (53,382)
Realized losses on securities, net of tax     556  
Amortization of unrealized losses on securities previously transferred to held to maturity, net of tax     731  
Amortization of pension net loss, transition liability and prior service cost, net of tax     246 237
TOTAL OTHER COMPREHENSIVE LOSS     (6,755) (53,145)
Ending balance $ (64,767) $ (62,690) $ (64,767) $ (62,690)
[1] Gross amounts are included in net gains on sales or call of securities on the Consolidated Statements of Income in total other income.
[2] Income tax amounts are included in the provision for income taxes on the Consolidated Statements of Income.
[3] Total unrealized loss remaining on investment securities held to maturity, net of income taxes, was $2.3 million at September 30, 2023
[4] Gross amounts are included in the computation of net periodic benefit cost and are included in salaries and employee benefits on the Consolidated Statements of Income in total other expenses.