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Regulatory Capital Requirements (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Retained earnings from prior two years available for dividends $ 15,850,000    
Capital conservation buffer phase in, minimum (as a percentage) 2.25%   0.00%
Capital conservation buffer phase in, maximum (as a percentage)     2.50%
Capital conservation buffer (as a percentage) 7.24%    
Tier 1 capital to risk-weighted assets [Abstract]      
Actual $ 153,114,000 $ 142,564,000  
Actual 153,114,000 142,564,000  
For capital adequacy purposes   $ 43,835,000  
Risk-weighted assets [Abstract]      
Actual (in hundredths)   14.64%  
For capital adequacy purposes (in hundredths)   4.50%  
Non Consolidated      
Tier 2 capital to risk-weighted asets [Abstract]      
Actual 162,355,000 $ 151,487,000  
For capital adequacy purposes 86,063,000 77,928,000  
To be well-capitalized under prompt corrective action provisions 107,579,000 97,410,000  
Tier 1 capital to risk-weighted assets [Abstract]      
Actual 151,526,000 141,249,000  
For capital adequacy purposes 64,548,000 58,446,000  
To be well-capitalized under prompt corrective action provisions 86,063,000 77,928,000  
Actual 151,526,000 141,249,000  
For capital adequacy purposes 48,411,000 43,835,000  
To be well-capitalized under prompt corrective action provisions $ 69,926,000 $ 63,317,000  
Risk-weighted assets [Abstract]      
Actual (in hundredths) 15.09% 15.55%  
For capital adequacy purposes (in hundredths) 8.00% 8.00%  
To be well-capitalized under prompt corrective action provisions (in hundredths) 10.00% 10.00%  
Actual (in hundredths) 14.09% 14.50%  
For capital adequacy purposes (in hundredths) 6.00% 6.00%  
To be well-capitalized under prompt corrective action provisions (in hundredths) 8.00% 8.00%  
Actual (in hundredths) 14.09% 14.50%  
For capital adequacy purposes (in hundredths) 4.50% 4.50%  
To be well-capitalized under prompt corrective action provisions (in hundredths) 6.50% 6.50%  
Tier 1 capital to average assets [Abstract]      
Actual $ 151,526,000 $ 141,249,000  
For capital adequacy purpose 71,386,000 65,437,000  
To be well-capitalized under prompt corrective action provisions $ 89,233,000 $ 81,797,000  
Average assets [Abstract]      
Actual (in hundredths) 8.49% 8.63%  
For capital adequacy purpose (in hundredths) 4.00% 4.00%  
To be well-capitalized under prompt corrective action provisions (in hundredths) 5.00% 5.00%  
Consolidated      
Tier 2 capital to risk-weighted asets [Abstract]      
Actual $ 163,943,000 $ 152,802,000  
For capital adequacy purposes 86,070,000 77,928,000  
Tier 1 capital to risk-weighted assets [Abstract]      
For capital adequacy purposes 64,553,000 $ 58,446,000  
For capital adequacy purposes $ 48,415,000    
Risk-weighted assets [Abstract]      
Actual (in hundredths) 15.24% 15.69%  
For capital adequacy purposes (in hundredths) 8.00% 8.00%  
Actual (in hundredths) 14.23% 14.64%  
For capital adequacy purposes (in hundredths) 6.00% 6.00%  
Actual (in hundredths) 14.23%    
For capital adequacy purposes (in hundredths) 4.50%    
Tier 1 capital to average assets [Abstract]      
Actual $ 153,114,000 $ 142,564,000  
For capital adequacy purpose $ 71,435,000 $ 65,470,000  
Average assets [Abstract]      
Actual (in hundredths) 8.57% 8.71%  
For capital adequacy purpose (in hundredths) 4.00% 4.00%