Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Recurring | Level 1
Fair Value Measurements
Total assets	$ 9,969	$ 11,653
Recurring | Level 1 | Financial institution equity securities
Fair Value Measurements
Total assets	9,051	9,548
Recurring | Level 1 | Other equity securities
Fair Value Measurements
Total assets	918	2,105
Recurring | Level 2
Fair Value Measurements
Total assets	278,608	277,663
Recurring | Level 2 | U.S. Government and agency securities
Fair Value Measurements
Total assets	23,635	25,840
Recurring | Level 2 | State and political securities
Fair Value Measurements
Total assets	169,393	180,224
Recurring | Level 2 | Other debt securities
Fair Value Measurements
Total assets	85,580	71,599
Recurring | Total
Fair Value Measurements
Total assets	288,577	289,316
Recurring | Total | U.S. Government and agency securities
Fair Value Measurements
Total assets	23,635	25,840
Recurring | Total | State and political securities
Fair Value Measurements
Total assets	169,393	180,224
Recurring | Total | Other debt securities
Fair Value Measurements
Total assets	85,580	71,599
Recurring | Total | Financial institution equity securities
Fair Value Measurements
Total assets	9,051	9,548
Recurring | Total | Other equity securities
Fair Value Measurements
Total assets	918	2,105
Non-recurring | Level 3
Fair Value Measurements
Total assets	13,171	15,884
Non-recurring | Level 3 | Impaired loans
Fair Value Measurements
Total assets	12,052	14,435
Non-recurring | Level 3 | Other real estate owned
Fair Value Measurements
Total assets	1,119	1,449
Non-recurring | Total
Fair Value Measurements
Total assets	13,171	15,884
Non-recurring | Total | Impaired loans
Fair Value Measurements
Total assets	12,052	14,435
Non-recurring | Total | Other real estate owned
Fair Value Measurements
Total assets	$ 1,119	$ 1,449