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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, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on investment securities   $ 206
Interest income $ 29,628 26,995
Income before income taxes 11,556 11,108
Income tax (expense) benefit (2,268) (3,165)
Net income 9,288 7,943
Total reclassified for the period (188) (46)
Securities Available for Sale and Transferred Securities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [1] (82) 203
Reclassification tax [1] 21 (78)
Total reclassified for the period [1] (61) 125
Prior Service Credit [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [2] 18 [1] 13
Net Actuarial Losses [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax [1],[2] (187) (292)
Pension And Post-Retirement Obligations [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassification before tax (169) (279)
Reclassification tax 42 108
Total reclassified for the period (127) (171)
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   206
Interest income (82) (3)
Income before income taxes (82) 203
Income tax (expense) benefit 21 (78)
Net income $ (61) $ 125
[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 11 - Employee Benefit Plans for additional information.