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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain (loss) on investment securities $ 71 $ 1,599 $ 1,677
Interest income 154,730 138,985 129,912
Income before income taxes 97,222 45,723 59,421
Income tax benefit (19,525) (7,391) (10,559)
Net income 77,697 38,332 48,862
Securities Available for Sale and Transferred Securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [1] 139 (1,281) (1,176)
Reclassification tax [1] (36) 329 307
Total reclassified for the period [1] 103 (952) (869)
Prior Service Credit [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [2] 3 34  
Net Actuarial Losses [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [2] (744) (1,288)  
Pension And Post-Retirement Obligations [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax (741) (1,254)  
Reclassification tax 190 321  
Total reclassified for the period (551) (933) (1,046)
AOCI Attributable to Parent [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassified for the period (654) (19) $ (177)
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 (loss) on investment securities 71 1,599  
Interest income (210) (318)  
Income before income taxes (139) 1,281  
Income tax benefit (36) (329)  
Net income $ (103) $ 952  
[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 21 – Employee Benefit Plans for additional information.