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Income Taxes (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
limited_partnership
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
limited_partnership
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
limited_partnership
Dec. 31, 2017
USD ($)
limited_partnership
Dec. 31, 2016
USD ($)
Federal income tax                      
Current                 $ 4,407 $ 4,184 $ 6,276
Deferred                 (492) 2,083 (139)
Federal income tax expense                 3,915 6,267 6,137
State franchise tax                 391 345 317
Income tax expense $ 1,222 $ 1,088 $ 1,040 $ 956 $ 1,782 $ 1,702 $ 1,644 $ 1,484 4,306 6,612 6,454
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 5,847 9,170 8,562
Non-taxable income                 (1,699) (2,625) (2,176)
State franchise tax, net of federal tax benefit                 309 224 206
Equity compensation                 (55) (83) 0
Tax credits, net of amortization                 (85) (88) (105)
Change in federal tax rate                 0 134 0
Other                 (11) (120) (33)
Income tax expense 1,222 $ 1,088 $ 1,040 $ 956 1,782 $ 1,702 $ 1,644 $ 1,484 4,306 6,612 $ 6,454
Components of deferred tax assets and liabilities                      
Allowance for loan losses 2,359       2,253       2,359 2,253  
OREO 0       11       0 11  
Accrued pension and post-retirement 955       1,036       955 1,036  
Unrealized loss on securities transferred from available for sale to held to maturity 52       46       52 46  
Unrealized loss on securities available for sale 1,343       772       1,343 772  
Restricted stock grants 170       173       170 173  
Core deposit intangible 18       15       18 15  
Investment in flow through entities 31       22       31 22  
Other assets 24       28       24 28  
Total deferred tax asset 4,952       4,356       4,952 4,356  
Net deferred loan costs (1,504)       (1,313)       (1,504) (1,313)  
Depreciation (1,300)       (1,306)       (1,300) (1,306)  
Goodwill (80)       (39)       (80) (39)  
Mortgage servicing rights (284)       (266)       (284) (266)  
Unrealized gain on derivative instruments (382)       (410)       (382) (410)  
Prepaid expense (159)       (821)       (159) (821)  
Total deferred tax liability (3,709)       (4,155)       (3,709) (4,155)  
Net deferred tax asset $ 1,243       $ 201       $ 1,243 $ 201  
Limited partnerships                      
Limited partnerships held as investments | limited_partnership 3       2       3 2  
Tax credits from investments in limited partnerships                 $ 210 $ 204  
Amortization of investments in limited partnerships                 186 178  
Carrying value of investments in limited partnerships $ 1,408       $ 1,408       1,408 1,408  
Total exposure to limited partnerships $ 1,408       $ 1,408       $ 1,408 $ 1,408