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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net loss on investment securities $ 0     $ 0     $ 0 $ 15
Interest income 41,677     43,068     125,829 124,223
Income (loss) before income taxes 16,462     18,579     48,117 56,512
Income tax expense (2,440)     (4,725)     (7,633) (12,027)
Net income (loss) 14,022 $ 14,373 $ 12,089 13,854 $ 15,648 $ 14,983 40,484 44,485
Securities Available for Sale and Transferred Securities [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification, Pre-tax Amount (16) [1]     (23) [2]     (51) [1] (95) [2]
Reclassification tax 4 [1]     7 [2]     13 [1] 25 [2]
Total reclassified for the period (12) [1]     (16) [2]     (38) [1] (70) [2]
Prior Service Credit [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification, Pre-tax Amount [3] 123     0     368 0
Net Actuarial Losses [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification, Pre-tax Amount [3] (316)     (64)     (948) (192)
Pension And Post-Retirement Obligations [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification, Pre-tax Amount (193)     (64)     (580) (192)
Reclassification tax 50     16     149 49
Total reclassified for the period (143)     (48)     (431) (143)
Accumulated Other Comprehensive income [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Total reclassified for the period (155)     (64)     (469) (213)
Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member] | Securities Available for Sale and Transferred Securities [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net loss on investment securities 0     0     0 (15)
Interest income (16)     (23)     (51) (80)
Income (loss) before income taxes (16)     (23)     (51) (95)
Income tax expense 4     7     13 25
Net income (loss) $ (12)     $ (16)     $ (38) $ (70)
[1] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
[2] Includes amounts related to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available for sale investment securities to the held to maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
[3] These items are included in the computation of net periodic pension expense. See Note 13 – Employee Benefit Plans for additional information.