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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
Sep. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value $ 50,216 $ 39,560
Less than 12 Months, Unrealized Losses (1,401) (548)
12 Months or More, Fair Value 181,881 179,651
12 Months or More, Unrealized Losses (10,154) (4,869)
Total, Fair Value 232,097 219,211
Total, Unrealized Losses (11,555) (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 30,755 17,310
Less than 12 Months, Unrealized Losses (1,075) (228)
12 Months or More, Fair Value 51,547 44,948
12 Months or More, Unrealized Losses (2,386) (829)
Total, Fair Value 82,302 62,258
Total, Unrealized Losses (3,461) (1,057)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 2,054 0
Less than 12 Months, Unrealized Losses (23) 0
12 Months or More, Fair Value 6,630 6,859
12 Months or More, Unrealized Losses (231) (95)
Total, Fair Value 8,684 6,859
Total, Unrealized Losses (254) (95)
Mortgage-backed Securities-Government Sponsored Entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 17,407 22,250
Less than 12 Months, Unrealized Losses (303) (320)
12 Months or More, Fair Value 123,704 125,846
12 Months or More, Unrealized Losses (7,537) (3,942)
Total, Fair Value 141,111 148,096
Total, Unrealized Losses $ (7,840) $ (4,262)