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Condensed Financial Statements of Parent Company (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities                      
Net income $ 2,525 $ 2,441 $ 2,538 $ 2,284 $ 2,885 $ 2,081 $ 1,567 $ 1,981 $ 9,788 $ 8,514 $ 6,981
Changes in Assets and Liabilities:                      
Net cash provided by operating activities                 14,214 17,159 11,435
Cash Flows from Financing Activities                      
Cash dividends paid on common stock                 (3,597) (3,567) (3,402)
Purchase of Treasury Stock                 (894) (310) (894)
Net Increase (Decrease) in Cash and Cash Equivalents                 949 1,720 9,731
Cash and Cash Equivalents                      
Cash and Cash Equivalents - Beginning of Year       45,099       43,379 45,099 43,379 33,648
Cash and Cash Equivalents - End of Year 44,092       45,099       44,092 45,099 43,379
Parent Company [Member]
                      
Cash Flows from Operating Activities                      
Net income                 9,788 8,514 6,981
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:                      
Equity in undistributed net income (Distributions in excess earnings) of subsidiaries                 (5,649) (4,372) (2,617)
Changes in Assets and Liabilities:                      
Dividends receivable                 260 (111) (42)
Other Liabilities                 282 231 101
Net cash provided by operating activities                 4,681 4,262 4,423
Cash Flows from Investing Activities                      
Return of Capital from Investment in Subsidiary                         
Cash Flows from Financing Activities                      
Cash dividends paid on common stock                 (3,597) (3,567) (3,402)
Purchase of Treasury Stock                 (894) (310) (894)
Net Increase (Decrease) in Cash and Cash Equivalents                 190 385 127
Cash and Cash Equivalents                      
Cash and Cash Equivalents - Beginning of Year       983       598 983 598 471
Cash and Cash Equivalents - End of Year $ 1,173       $ 983       $ 1,173 $ 983 $ 598