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Securities (Schedule Of Investments' Gross Unrealized Losses and Fair Value Aggregated by Security Type and Lengthof Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value $ 68,323 $ 39,560
Less than 12 Months, Unrealized Losses (1,648) (548)
12 Months or More, Fair Value 164,116 179,651
12 Months or More, Unrealized Losses (8,210) (4,869)
Total, Fair Value 232,439 219,211
Total, Unrealized Losses (9,858) (5,417)
US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or More, Fair Value   1,998
12 Months or More, Unrealized Losses   (3)
Total, Fair Value   1,998
Total, Unrealized Losses   (3)
States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 36,534 17,310
Less than 12 Months, Unrealized Losses (860) (228)
12 Months or More, Fair Value 42,947 44,948
12 Months or More, Unrealized Losses (1,760) (829)
Total, Fair Value 79,481 62,258
Total, Unrealized Losses (2,620) (1,057)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 2,065 0
Less than 12 Months, Unrealized Losses (22) 0
12 Months or More, Fair Value 6,645 6,859
12 Months or More, Unrealized Losses (248) (95)
Total, Fair Value 8,710 6,859
Total, Unrealized Losses (270) (95)
Mortgage-backed Securities-Government Sponsored Entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 29,724 22,250
Less than 12 Months, Unrealized Losses (766) (320)
12 Months or More, Fair Value 114,524 125,846
12 Months or More, Unrealized Losses (6,202) (3,942)
Total, Fair Value 144,248 148,096
Total, Unrealized Losses $ (6,968) $ (4,262)