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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
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value $ 66,650 $ 39,560
Less than 12 Months, Unrealized Losses (1,501) (548)
12 Months or More, Fair Value 169,690 179,651
12 Months or More, Unrealized Losses (7,629) (4,869)
Total, Fair Value 236,340 219,211
Total, Unrealized Losses (9,130) (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 37,210 17,310
Less than 12 Months, Unrealized Losses (849) (228)
12 Months or More, Fair Value 43,704 44,948
12 Months or More, Unrealized Losses (1,738) (829)
Total, Fair Value 80,914 62,258
Total, Unrealized Losses (2,587) (1,057)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 2,076 0
Less than 12 Months, Unrealized Losses (21) 0
12 Months or More, Fair Value 6,691 6,859
12 Months or More, Unrealized Losses (232) (95)
Total, Fair Value 8,767 6,859
Total, Unrealized Losses (253) (95)
Mortgage-backed Securities-Government Sponsored Entities [Member]    
Schedule of Investments [Line Items]    
Less than 12 Months, Fair Value 27,364 22,250
Less than 12 Months, Unrealized Losses (631) (320)
12 Months or More, Fair Value 119,295 125,846
12 Months or More, Unrealized Losses (5,659) (3,942)
Total, Fair Value 146,659 148,096
Total, Unrealized Losses $ (6,290) $ (4,262)