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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other comprehensive income, net of tax:      
Unrealized holding gains arising during the period, tax $ 722 $ 1,193 $ (112)
Reclassification adjustment due to gains realized on sales of securities, tax (3) (372) (265)
Directors' and officers' retirement plan equity adjustments, tax (110) (118) (93)
Total other comprehensive income, tax $ 609 $ 703 $ (470)