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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net gain on investment securities $ (0)     $ 554     $ 71 $ 1,449
Interest income 38,273     35,499     113,862 102,804
Income before income taxes 21,728     15,213     73,385 30,235
Income tax expense (4,553)     (2,940)     (15,300) (5,703)
Net income 17,175 $ 20,200 $ 20,710 12,273 $ 11,132 $ 1,127 58,085 24,532
Total reclassified for the period (169)     114     (491) 202
Securities Available for Sale and Transferred Securities [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification before tax [1] (42)     467     (105) 1,213
Reclassification tax [1] 11     (120)     27 (311)
Total reclassified for the period [1] (31)     347     (78) 902
Prior Service Credit [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification before tax [2]       8     2 26
Net Actuarial Losses [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification before tax [2] (186)     (321)     (557) (967)
Pension And Post-Retirement Obligations [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Reclassification before tax (185)     (313)     (555) (941)
Reclassification tax 47     80     142 241
Total reclassified for the period (138)     (233)     (413) (700)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Securities Available for Sale and Transferred Securities [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net gain on investment securities (0)     554     71 1,449
Interest income (42)     (87)     (176) (236)
Income before income taxes (42)     467     (105) 1,213
Income tax expense 11     (120)     27 (311)
Net income $ (31)     $ 347     $ (78) $ 902
[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] These items are included in the computation of net periodic pension expense. See Note 14 – Employee Benefit Plans for additional information.