3. Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012		Jun. 30, 2012
Available for sale securities, fair value	$ 291,180	$ 281,539	[1]	$ 289,151
U S Government Corporations And Agencies Securities [Member]
Available for sale securities, fair value	36,764	29,020
Government Sponsored Agencies [Member]
Available for sale securities, fair value	148,541	136,570
Nongovernment Sponsored Agencies [Member]
Available for sale securities, fair value	12,657	15,745
U S States And Political Subdivisions [Member]
Available for sale securities, fair value	13,347	12,169
Corporate Debt Securities [Member]
Available for sale securities, fair value	3,959	1,950
Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Available for sale securities, fair value	75,835	83,270
Equity Securities [Member]
Available for sale securities, fair value	77	77
Tax Exempt Mortgage Backed Securities [Member]
Available for sale securities, fair value	0	2,738
Fair Value Inputs Level1 [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | U S Government Corporations And Agencies Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Government Sponsored Agencies [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Nongovernment Sponsored Agencies [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | U S States And Political Subdivisions [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Corporate Debt Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Equity Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level1 [Member] | Tax Exempt Mortgage Backed Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level2 [Member]
Available for sale securities, fair value	291,180	281,539
Fair Value Inputs Level2 [Member] | U S Government Corporations And Agencies Securities [Member]
Available for sale securities, fair value	36,764	29,020
Fair Value Inputs Level2 [Member] | Government Sponsored Agencies [Member]
Available for sale securities, fair value	148,541	136,570
Fair Value Inputs Level2 [Member] | Nongovernment Sponsored Agencies [Member]
Available for sale securities, fair value	12,657	15,745
Fair Value Inputs Level2 [Member] | U S States And Political Subdivisions [Member]
Available for sale securities, fair value	13,347	12,169
Fair Value Inputs Level2 [Member] | Corporate Debt Securities [Member]
Available for sale securities, fair value	3,959	1,950
Fair Value Inputs Level2 [Member] | Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Available for sale securities, fair value	75,835	83,270
Fair Value Inputs Level2 [Member] | Equity Securities [Member]
Available for sale securities, fair value	77	77
Fair Value Inputs Level2 [Member] | Tax Exempt Mortgage Backed Securities [Member]
Available for sale securities, fair value	0	2,738
Fair Value Inputs Level3 [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | U S Government Corporations And Agencies Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Government Sponsored Agencies [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Nongovernment Sponsored Agencies [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | U S States And Political Subdivisions [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Corporate Debt Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Equity Securities [Member]
Available for sale securities, fair value	0	0
Fair Value Inputs Level3 [Member] | Tax Exempt Mortgage Backed Securities [Member]
Available for sale securities, fair value	$ 0	$ 0

[1] December 31, 2012 financial information has been extracted from audited consolidated financial statements