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Quarterly Information (Details) (USD $)
 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
Dec. 31, 2009
Balance Sheets                        
Cash $ 14,958,000 $ 14,904,000 $ 14,192,000 $ 12,123,000 $ 14,115,000 $ 16,563,000 $ 14,322,000 $ 13,700,000 $ 14,958,000 $ 14,115,000    
Interest bearing deposits in other banks 1,638,000 681,000 0 1,532,000 0 100,000 100,000 100,000 1,638,000 0    
Investments 434,934,000 454,156,000 443,122,000 454,717,000 408,863,000 456,481,000 427,248,000 435,387,000 434,934,000 408,863,000    
Restricted equity securities 14,448,000 14,448,000 14,448,000 14,823,000 15,443,000 15,443,000 15,443,000 15,443,000 14,448,000 15,443,000    
Net loans for sale and loans held 857,819,000 855,132,000 867,808,000 858,122,000 851,988,000 853,484,000 872,314,000 881,134,000 857,819,000 851,988,000    
Other assets 91,202,000 83,995,000 85,187,000 82,475,000 82,458,000 84,967,000 88,263,000 85,274,000 91,202,000 82,458,000    
Total assets 1,414,999,000 1,423,316,000 1,424,757,000 1,423,792,000 1,372,867,000 1,427,038,000 1,417,690,000 1,431,038,000 1,414,999,000 1,372,867,000    
Total deposits 958,850,000 944,547,000 1,005,274,000 1,015,835,000 941,333,000 1,004,894,000 998,838,000 1,050,257,000 958,850,000 941,333,000    
Borrowed funds 282,905,000 304,749,000 248,926,000 240,151,000 265,663,000 255,616,000 249,336,000 217,534,000 282,905,000 265,663,000    
Other liabilities 16,921,000 17,383,000 17,152,000 16,213,000 15,013,000 15,990,000 13,306,000 11,703,000 16,921,000 15,013,000    
Shareholders' equity 156,323,000 156,637,000 153,405,000 151,593,000 150,858,000 150,538,000 156,210,000 151,544,000 156,323,000 150,858,000 149,848,000 147,938,000
Total liabilities and shareholders' equity 1,414,999,000 1,423,316,000 1,424,757,000 1,423,792,000 1,372,867,000 1,427,038,000 1,417,690,000 1,431,038,000 1,414,999,000 1,372,867,000    
Statements of Income                        
Interest income 12,694,000 12,892,000 13,133,000 13,106,000 13,553,000 13,898,000 13,997,000 14,254,000 51,825,000 55,702,000 57,260,000  
Interest expense 3,201,000 3,222,000 3,215,000 3,300,000 3,516,000 3,670,000 3,774,000 3,749,000 12,938,000 14,709,000 16,671,000  
Net interest income 9,493,000 9,670,000 9,918,000 9,806,000 10,037,000 10,228,000 10,223,000 10,505,000 38,887,000 40,993,000 40,589,000  
Provision for loan losses 1,535,000 1,400,000 2,800,000 2,100,000 4,950,000 1,500,000 2,000,000 2,100,000 7,835,000 10,550,000 8,400,000  
Net interest income after provision for loan losses 7,958,000 8,270,000 7,118,000 7,706,000 5,087,000 8,728,000 8,223,000 8,405,000 31,052,000 30,443,000 32,189,000  
Non-interest income 2,722,000 2,492,000 3,896,000 2,168,000 5,159,000 2,080,000 2,234,000 2,277,000 11,278,000 11,750,000 9,135,000  
Non-interest expense 6,768,000 6,595,000 6,730,000 6,178,000 6,366,000 6,934,000 6,250,000 6,488,000 26,271,000 26,038,000 25,130,000  
Income (loss) before income taxes 3,912,000 4,167,000 4,284,000 3,696,000 3,880,000 3,874,000 4,207,000 4,194,000 16,059,000 16,155,000 16,194,000  
Applicable tax expense 683,000 944,000 961,000 783,000 858,000 868,000 1,014,000 1,051,000 3,371,000 3,791,000 4,078,000  
Net income 3,229,000 3,223,000 3,323,000 2,913,000 3,022,000 3,006,000 3,193,000 3,143,000 12,688,000 12,364,000 12,116,000  
Net income available to common shareholders                 11,965,000 11,156,000 10,768,000  
Basic earnings per common share $ 0.31 $ 0.31 $ 0.32 $ 0.28 $ 0.29 $ 0.27 $ 0.29 $ 0.29 $ 1.22 $ 1.14 $ 1.10  
Diluted earnings per common share $ 0.31 $ 0.31 $ 0.32 $ 0.28 $ 0.29 $ 0.27 $ 0.29 $ 0.29 $ 1.22 $ 1.14 $ 1.10  
Net unrealized gain on securities available for sale (1,548,000) 1,962,000 438,000 (313,000) (754,000) 5,957,000 3,587,000 668,000 539,000 9,458,000 (1,932,000)  
Unrecognized postretirement benefits transition obligation (51,000) 5,000 5,000 5,000 (28,000) 4,000 5,000 5,000 (36,000) (14,000) 138,000  
Other comprehensive income (1,599,000) 1,967,000 443,000 (308,000) (782,000) 5,961,000 3,592,000 673,000 503,000 9,444,000 (1,794,000)  
Comprehensive income $ 1,630,000 $ 5,190,000 $ 3,766,000 $ 2,605,000 $ 2,240,000 $ 8,967,000 $ 6,785,000 $ 3,816,000 $ 13,191,000 $ 21,808,000 $ 10,322,000