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Income Taxes (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
limited_partnership
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
limited_partnership
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
limited_partnership
Dec. 31, 2015
USD ($)
limited_partnership
Dec. 31, 2014
USD ($)
Federal income tax                      
Current                 $ 6,276,000 $ 4,895,000 $ 4,282,000
Deferred                 (139,000) 332,000 18,000
Federal income tax expense                 6,137,000 5,227,000 4,300,000
State income tax [Abstract]                      
State franchise tax                 317,000 287,000 266,000
Income tax expense $ 1,470,000 $ 1,656,000 $ 1,713,000 $ 1,615,000 $ 1,245,000 $ 1,391,000 $ 1,458,000 $ 1,420,000 6,454,000 5,514,000 4,566,000
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 8,562,000 7,602,000 6,746,000
Non-taxable income                 (2,176,000) (2,086,000) (2,292,000)
State franchise tax, net of federal tax benefit                 206,000 187,000 173,000
Tax credits, net of amortization                 (105,000) (185,000) (414,000)
Other                 (33,000) (4,000) 353,000
Income tax expense 1,470,000 $ 1,656,000 $ 1,713,000 $ 1,615,000 1,245,000 $ 1,391,000 $ 1,458,000 $ 1,420,000 6,454,000 5,514,000 $ 4,566,000
Components of deferred tax assets and liabilities                      
Allowance for loan losses 3,548,000       3,471,000       3,548,000 3,471,000  
OREO 72,000       57,000       72,000 57,000  
Accrued pension and post-retirement 1,730,000       1,769,000       1,730,000 1,769,000  
Goodwill 2,000       70,000       2,000 70,000  
Unrealized loss on securities transferred from available for sale to held to maturity 70,000       60,000       70,000 60,000  
Unrealized loss on securities available for sale 503,000       0       503,000 0  
Restricted stock grants 237,000       367,000       237,000 367,000  
Core deposit intangible 20,000       15,000       20,000 15,000  
Investment in flow through entities 29,000       0       29,000 0  
Other assets 48,000       93,000       48,000 93,000  
Total deferred tax asset 6,259,000       5,902,000       6,259,000 5,902,000  
Net deferred loan costs (1,895,000)       (1,445,000)       (1,895,000) (1,445,000)  
Depreciation (1,808,000)       (2,000,000)       (1,808,000) (2,000,000)  
Unrealized gain on securities available for sale 0       (605,000)       0 (605,000)  
Mortgage servicing rights (390,000)       (382,000)       (390,000) (382,000)  
Unrealized gain on derivative instruments (626,000)       0       (626,000) 0  
Investment in flow through entities 0       (425,000)       0 (425,000)  
Prepaid expense 0       (104,000)       0 (104,000)  
Total deferred tax liability (4,719,000)       (4,961,000)       (4,719,000) (4,961,000)  
Net deferred tax asset $ 1,540,000       $ 941,000       $ 1,540,000 $ 941,000  
Limited partnerships                      
Limited partnerships held as investments | limited_partnership 2       2       2 2  
Tax credits from investments in limited partnerships                 $ 231,000 $ 244,000  
Amortization of investments in limited partnerships                 194,000 201,000  
Carrying value of investments in limited partnerships $ 1,503,000       $ 1,739,000       1,503,000 1,739,000  
Total exposure to limited partnerships $ 1,503,000       $ 1,739,000       $ 1,503,000 $ 1,739,000