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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
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on investment securities $ 74 $ 221
Interest income 37,857 33,124
Income before income taxes 26,057 1,449
Income tax (expense) benefit (5,347) (322)
Net income 20,710 1,127
Total reclassified for the period (137) (104)
Securities Available for Sale and Transferred Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [1] 1 175
Reclassification tax [1]   (45)
Total reclassified for the period [1] 1 130
Prior Service Credit [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [2] 1 9
Net Actuarial Losses [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [2] (186) (323)
Pension And Post-Retirement Obligations [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax (185) (314)
Reclassification tax 47 80
Total reclassified for the period (138) (234)
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 74 221
Interest income (73) (46)
Income before income taxes 1 175
Income tax (expense) benefit   (45)
Net income $ 1 $ 130
[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.