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Income Taxes (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
limited_partnership
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
limited_partnership
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
limited_partnership
Dec. 31, 2014
USD ($)
limited_partnership
Dec. 31, 2013
USD ($)
Federal income tax                      
Current                 $ 4,895 $ 4,282 $ 3,234
Deferred                 332 18 (56)
Federal income tax expense                 5,227 4,300 3,178
State income tax [Abstract]                      
State franchise tax                 287 266 247
Income tax expense $ 1,245 $ 1,391 $ 1,458 $ 1,420 $ 1,048 $ 1,400 $ 1,155 $ 963 5,514 4,566 3,425
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 7,602 6,746 5,736
Non-taxable income                 (2,086) (2,292) (2,326)
State franchise tax, net of federal tax benefit                 187 173 160
Tax credits                 (185) (414) (414)
Other                 (4) 353 269
Income tax expense 1,245 $ 1,391 $ 1,458 $ 1,420 1,048 $ 1,400 $ 1,155 $ 963 5,514 4,566 $ 3,425
Components of deferred tax assets and liabilities                      
Allowance for loan losses 3,471       3,620       3,471 3,620  
OREO 57       229       57 229  
Accrued pension and post-retirement 1,769       1,725       1,769 1,725  
Goodwill 70       138       70 138  
Unrealized loss on securities transferred from available for sale to held to maturity 60       26       60 26  
Restricted stock grants 367       264       367 264  
Core deposit intangible 15       5       15 5  
Other assets 93       48       93 48  
Total deferred tax asset 5,902       6,055       5,902 6,055  
Net deferred loan costs (1,445)       (1,120)       (1,445) (1,120)  
Depreciation (2,000)       (2,131)       (2,000) (2,131)  
Unrealized gain on securities available for sale (605)       (1,358)       (605) (1,358)  
Mortgage servicing rights (382)       (380)       (382) (380)  
Investment in flow through entities (425)       (387)       (425) (387)  
Prepaid expense (104)       (210)       (104) (210)  
Total deferred tax liability (4,961)       (5,586)       (4,961) (5,586)  
Net deferred tax asset $ 941       $ 469       $ 941 $ 469  
Limited partnerships                      
Limited partnerships held as investments | limited_partnership 1       2       1 2  
Tax credits from investments in limited partnerships                 $ 285 $ 636  
Amortization of investments in limited partnerships                 266 569  
Carrying value of investments in limited partnerships $ 69       $ 457       69 457  
Total exposure to limited partnerships $ 69       $ 3,957       $ 69 $ 3,957