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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net (loss) gain on investment securities $ (3)   $ 674   $ 71 $ 895
Interest income 37,732   34,181   75,589 67,305
Income before income taxes 25,600   13,573   51,657 15,022
Income tax (expense) benefit (5,400)   (2,441)   (10,747) (2,763)
Net income 20,200 $ 20,710 11,132 $ 1,127 40,910 12,259
Total reclassified for the period (185)   192   (322) 88
Securities Available for Sale and Transferred Securities [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Reclassification before tax [1] (64)   571   (63) 746
Reclassification tax [1] 16   (146)   16 (191)
Total reclassified for the period [1] (48)   425   (47) 555
Prior Service Credit [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Reclassification before tax [2]     9   1 18
Net Actuarial Losses [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Reclassification before tax [2] (185)   (323)   (371) (646)
Pension And Post-Retirement Obligations [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Reclassification before tax (185)   (314)   (370) (628)
Reclassification tax 48   81   95 161
Total reclassified for the period (137)   (233)   (275) (467)
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 (loss) gain on investment securities (3)   674   71 895
Interest income (61)   (103)   (134) (149)
Income before income taxes (64)   571   (63) 746
Income tax (expense) benefit 16   (146)   16 (191)
Net income $ (48)   $ 425   $ (47) $ 555
[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.