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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 22, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]                          
Statutory federal tax rate                     21.00% 35.00% 35.00%
Change in corporate federal statutory income tax rate 25.00% 21.00%                      
Net operating loss carryforward [1]     $ 50       $ 76       $ 50 $ 76  
Amounts of tax benefits that would affect effective tax rate if recognized     1,272       1,464       1,272 1,464 $ 1,225
Income tax accrued interest     136       139       136 139 108
Increase (reduction) in accrued interest                     3 31  
Reduction of tax benefits over the next twelve months                     316    
Income tax expense     1,502 $ 1,481 $ 1,387 $ 1,709 $ 3,576 [2] $ 2,396 $ 2,248 $ 1,665 $ 6,079 [3] $ 9,885 [2],[3] $ 7,716 [3]
Percentage of pre-tax income tax rate                     17.00% 28.00% 24.00%
Non-cash charge                     $ (74) $ 1,824
Impact of the reduction in the corporate tax rate deferred tax assets and liabilities expected                     1,824    
Reduction of tax expense                     74    
Franklin Bancorp [Member]                          
Income Taxes [Line Items]                          
Net operating loss carryforward     238               238    
Limitations on use     $ 122               $ 122    
Net operating loss carryforward expiration date                     Dec. 31, 2020    
[1] As of December 31, 2018, the Company had approximately $238,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company's use to approximately $122,000 per year during the carry forward period, which expires in 2020.
[2] Includes one-time, non-cash TCJA charge of $1,824,000
[3] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.