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Income Taxes (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
limitedPartnership
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
limitedPartnership
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
limitedPartnership
Dec. 31, 2019
USD ($)
limitedPartnership
Dec. 31, 2018
USD ($)
Federal income tax                      
Current                 $ 4,923 $ 3,978 $ 4,407
Deferred                 (262) 336 (492)
Federal income tax expense                 4,661 4,314 3,915
State franchise tax                 460 421 391
Income tax expense $ 1,285 $ 1,379 $ 1,256 $ 1,201 $ 1,261 $ 1,180 $ 1,180 $ 1,114 5,121 4,735 4,306
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 6,773 6,355 5,847
Non-taxable income                 (1,808) (1,749) (1,699)
State franchise tax, net of federal tax benefit                 348 332 309
Equity compensation                 (43) (45) (55)
Tax credits, net of amortization                 (144) (85) (85)
Other                 (5) (73) (11)
Income tax expense 1,285 $ 1,379 $ 1,256 $ 1,201 1,261 $ 1,180 $ 1,180 $ 1,114 5,121 4,735 $ 4,306
Components of deferred tax assets and liabilities                      
Allowance for loan losses 3,413       2,444       3,413 2,444  
OREO 9       0       9 0  
Accrued pension and post-retirement 948       926       948 926  
Unrealized loss on derivative instruments 1,865       345       1,865 345  
Unrealized loss on securities transferred from available for sale to held to maturity 35       48       35 48  
Restricted stock grants 270       203       270 203  
Core deposit intangible 24       21       24 21  
Investment in flow through entities 82       55       82 55  
Other assets 87       0       87 0  
Total deferred tax asset 6,733       4,042       6,733 4,042  
Net deferred loan costs (1,894)       (1,669)       (1,894) (1,669)  
Depreciation (2,013)       (1,434)       (2,013) (1,434)  
Unrealized gain on securities available for sale (1,332)       (972)       (1,332) (972)  
Goodwill (161)       (120)       (161) (120)  
Mortgage servicing rights (411)       (325)       (411) (325)  
Unrealized gain on derivative instruments (554)       (371)       (554) (371)  
Prepaid expense (195)       (205)       (195) (205)  
Total deferred tax liability (6,560)       (5,096)       (6,560) (5,096)  
Net deferred tax asset (liability) $ 173               $ 173    
Net deferred tax asset (liability)         $ (1,054)         $ (1,054)  
Limited partnerships                      
Limited partnerships held as investments | limitedPartnership 4       4       4 4  
Tax credits from investments in limited partnerships                 $ 351 $ 330  
Amortization of investments in limited partnerships                 311 307  
Carrying value of investments in limited partnerships $ 1,734       $ 1,951       $ 1,734 $ 1,951