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Employee Benefit Plans (The Major Categories Of Plan Assets Measured At Fair Value On a Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents $ 4,553 $ 3,780
Equity securities 36,019 34,166
Fixed income securities 32,043 31,742
Total Plan investments 75,252 72,358
Foreign Currencies [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 99 35
Government Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 9,783 7,180
Short Term Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 4,454 3,745
Common Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 13,326 13,083
Depository Receipts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 391 336
Commingled Pension Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 22,302 10,557
Fixed income securities 18,151 17,889
Other investments 2,637 2,670
Exchange Traded Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities   10,190
Collateralized Mortgage Obligations [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 633 608
All Other Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 2,862 3,439
Federal Home Loan Mortgage Corporation [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities   276
Federal National Mortgage Association [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 579 1,966
Government National Mortgage Association Certificates And Obligations Gnma Two [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities   384
Mortgage-Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 35  
Level 1 Inputs [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 99 35
Equity securities 13,717 23,609
Total Plan investments 13,816 23,644
Level 1 Inputs [Member] | Foreign Currencies [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 99 35
Level 1 Inputs [Member] | Common Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 13,326 13,083
Level 1 Inputs [Member] | Depository Receipts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 391 336
Level 1 Inputs [Member] | Exchange Traded Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities   10,190
Level 2 Inputs [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 4,454 3,745
Equity securities 22,302 10,557
Fixed income securities 32,043 31,742
Total Plan investments 58,799 46,044
Level 2 Inputs [Member] | Government Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 9,783 7,180
Level 2 Inputs [Member] | Short Term Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents 4,454 3,745
Level 2 Inputs [Member] | Commingled Pension Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities 22,302 10,557
Fixed income securities 18,151 17,889
Level 2 Inputs [Member] | Collateralized Mortgage Obligations [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 633 608
Level 2 Inputs [Member] | All Other Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 2,862 3,439
Level 2 Inputs [Member] | Federal Home Loan Mortgage Corporation [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities   276
Level 2 Inputs [Member] | Federal National Mortgage Association [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 579 1,966
Level 2 Inputs [Member] | Government National Mortgage Association Certificates And Obligations Gnma Two [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities   384
Level 2 Inputs [Member] | Mortgage-Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities 35  
Level 3 Inputs [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents
Equity securities
Fixed income securities
Total Plan investments 2,637 2,670
Level 3 Inputs [Member] | Foreign Currencies [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents
Level 3 Inputs [Member] | Government Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities
Level 3 Inputs [Member] | Short Term Investment Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Cash equivalents
Level 3 Inputs [Member] | Common Stock [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities
Level 3 Inputs [Member] | Depository Receipts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities
Level 3 Inputs [Member] | Commingled Pension Trust Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities
Fixed income securities
Other investments 2,637 2,670
Level 3 Inputs [Member] | Exchange Traded Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Equity securities  
Level 3 Inputs [Member] | Collateralized Mortgage Obligations [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities
Level 3 Inputs [Member] | All Other Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities
Level 3 Inputs [Member] | Federal Home Loan Mortgage Corporation [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities  
Level 3 Inputs [Member] | Federal National Mortgage Association [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities
Level 3 Inputs [Member] | Government National Mortgage Association Certificates And Obligations Gnma Two [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities  
Level 3 Inputs [Member] | Mortgage-Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fixed income securities