Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held for sale	$ 0	$ 176
Collateral-dependent impaired loans	1,661	1,075
Property held for sale	17,992	20,582
Commercial real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	518
Property held for sale	1,493	976
Construction and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	940	945
Property held for sale	16,177	19,327
Residential real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	203	130
Property held for sale	322	279
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held for sale	0	0
Collateral-dependent impaired loans	0	0
Property held for sale	0	0
Fair Value, Inputs, Level 1 [Member] | Commercial real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0
Property held for sale	0	0
Fair Value, Inputs, Level 1 [Member] | Construction and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
Property held for sale	0	0
Fair Value, Inputs, Level 1 [Member] | Residential real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
Property held for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held for sale	0	176
Collateral-dependent impaired loans	1,661	1,075
Property held for sale	17,992	20,582
Fair Value, Inputs, Level 2 [Member] | Commercial real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	518
Property held for sale	1,493	976
Fair Value, Inputs, Level 2 [Member] | Construction and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	940	945
Property held for sale	16,177	19,327
Fair Value, Inputs, Level 2 [Member] | Residential real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	203	130
Property held for sale	322	279
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loans held for sale	0	0
Collateral-dependent impaired loans	0	0
Property held for sale	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0
Property held for sale	0	0
Fair Value, Inputs, Level 3 [Member] | Construction and development [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
Property held for sale	0	0
Fair Value, Inputs, Level 3 [Member] | Residential real estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
Property held for sale	$ 0	$ 0