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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on investment securities $ 1,260 $ 2,695 $ 1,988
Interest income 112,615 102,690 95,313
Income before income taxes 43,471 44,141 38,876
Income tax (expense) benefit (9,945) (12,210) (10,539)
Net income 33,526 31,931 28,337
Total reclassified for the period (7) 1,158 833
Securities Available for Sale and Transferred Securities [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [1] 1,103 2,793 2,251
Reclassification tax [1] (426) (1,078) (868)
Total reclassified for the period [1] 677 1,715 1,383
Prior Service Credit [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [2] 51 48  
Net Actuarial Losses [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax [2] (1,166) (955)  
Pension And Post-Retirement Obligations [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification before tax (1,115) (907)  
Reclassification tax 431 350  
Total reclassified for the period (684) (557) $ (550)
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 1,260 2,695  
Interest income (157) 98  
Income before income taxes 1,103 2,793  
Income tax (expense) benefit (426) (1,078)  
Net income $ 677 $ 1,715  
[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 18 - Employee Benefit Plans for additional information.