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Income Taxes (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
limited_partnership
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
limited_partnership
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
limited_partnership
Dec. 31, 2016
USD ($)
limited_partnership
Dec. 31, 2015
USD ($)
Federal income tax                      
Current                 $ 4,184,000 $ 6,276,000 $ 4,895,000
Deferred                 2,083,000 (139,000) 332,000
Federal income tax expense                 6,267,000 6,137,000 5,227,000
State franchise tax                 345,000 317,000 287,000
Income tax expense $ 1,782,000 $ 1,702,000 $ 1,644,000 $ 1,484,000 $ 1,470,000 $ 1,656,000 $ 1,713,000 $ 1,615,000 6,612,000 6,454,000 5,514,000
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 9,170,000 8,562,000 7,602,000
Non-taxable income                 (2,625,000) (2,176,000) (2,086,000)
State franchise tax, net of federal tax benefit                 224,000 206,000 187,000
Equity compensation                 (83,000) 0 0
Tax credits, net of amortization                 (88,000) (105,000) (185,000)
Change in federal tax rate                 134,000 0 0
Other                 (120,000) (33,000) (4,000)
Income tax expense 1,782,000 $ 1,702,000 $ 1,644,000 $ 1,484,000 1,470,000 $ 1,656,000 $ 1,713,000 $ 1,615,000 6,612,000 6,454,000 $ 5,514,000
Components of deferred tax assets and liabilities                      
Allowance for loan losses 2,253,000       3,548,000       2,253,000 3,548,000  
OREO 11,000       72,000       11,000 72,000  
Accrued pension and post-retirement 1,036,000       1,730,000       1,036,000 1,730,000  
Goodwill 0       2,000       0 2,000  
Unrealized loss on securities transferred from available for sale to held to maturity 46,000       70,000       46,000 70,000  
Unrealized loss on securities available for sale 772,000       503,000       772,000 503,000  
Restricted stock grants 173,000       237,000       173,000 237,000  
Core deposit intangible 15,000       20,000       15,000 20,000  
Investment in flow through entities 22,000       29,000       22,000 29,000  
Other assets 28,000       48,000       28,000 48,000  
Total deferred tax asset 4,356,000       6,259,000       4,356,000 6,259,000  
Net deferred loan costs (1,313,000)       (1,895,000)       (1,313,000) (1,895,000)  
Depreciation (1,306,000)       (1,808,000)       (1,306,000) (1,808,000)  
Goodwill (39,000)       0       (39,000) 0  
Mortgage servicing rights (266,000)       (390,000)       (266,000) (390,000)  
Unrealized gain on derivative instruments (410,000)       (626,000)       (410,000) (626,000)  
Prepaid expense (821,000)       0       (821,000) 0  
Total deferred tax liability (4,155,000)       (4,719,000)       (4,155,000) (4,719,000)  
Net deferred tax asset $ 201,000       $ 1,540,000       $ 201,000 $ 1,540,000  
Limited partnerships                      
Limited partnerships held as investments | limited_partnership 2       2       2 2  
Tax credits from investments in limited partnerships                 $ 204,000 $ 231,000  
Amortization of investments in limited partnerships                 178,000 194,000  
Carrying value of investments in limited partnerships $ 1,408,000       $ 1,503,000       1,408,000 1,503,000  
Total exposure to limited partnerships $ 1,408,000       $ 1,503,000       $ 1,408,000 $ 1,503,000