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Income Taxes (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
Federal income tax [Abstract]                      
Current                 $ 3,239,000 $ 2,828,000 $ 3,450,000
Deferred                 (108,000) 730,000 395,000
Federal income tax expense                 3,131,000 3,558,000 3,845,000
State income tax [Abstract]                      
State franchise tax                 240,000 233,000 233,000
Income 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
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 5,621,000 5,654,000 5,668,000
Non-taxable income                 (2,096,000) (1,794,000) (1,527,000)
State franchise tax, net of federal tax benefit                 156,000 152,000 151,000
Tax credits, net of amortization                 (414,000) (383,000) (345,000)
Other                 104,000 162,000 131,000
Income 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
Components of deferred tax assets and liabilities                      
Allowance for loan losses 4,375,000       4,550,000       4,375,000 4,550,000  
Other real estate owned 131,000       153,000       131,000 153,000  
Accrued pension and post-retirement 1,412,000       1,293,000       1,412,000 1,293,000  
Unrealized loss on securities available for sale 0       0       0 0  
Other than temporary impairment of securities available for sale 0       0       0 0  
Other assets 192,000       57,000       192,000 57,000  
Total deferred tax asset 6,110,000       6,053,000       6,110,000 6,053,000  
Net deferred loan costs (770,000)       (664,000)       (770,000) (664,000)  
Depreciation (2,326,000)       (2,236,000)       (2,326,000) (2,236,000)  
Unrealized gain on securities available for sale (4,275,000)       (3,985,000)       (4,275,000) (3,985,000)  
Mortgage servicing rights (303,000)       (421,000)       (303,000) (421,000)  
Core deposit intangible (203,000)       (303,000)       (203,000) (303,000)  
Investment in flow through entities (323,000)       (264,000)       (323,000) (264,000)  
Prepaid expense (422,000)       (528,000)       (422,000) (528,000)  
Other liabilities 0       (2,000)       0 (2,000)  
Total deferred tax liability (8,622,000)       (8,403,000)       (8,622,000) (8,403,000)  
Net deferred tax liability (2,512,000)       (2,350,000)       (2,512,000) (2,350,000)  
Limited partnerships                      
Limited partnerships held as investments 2               2    
Tax credits from investments in limited partnerships                 636,000    
Amortization of investments in limited partnerships                 476,000 390,000  
Carrying value of investments in limited partnerships 1,546,000       2,022,000       1,546,000 2,022,000  
Total exposure to limited partnerships $ 5,046,000       $ 5,522,000       $ 5,046,000 $ 5,522,000