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Regulatory Capital Requirements (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Retained earnings from prior two years available for dividends $ 13,560,000  
Capital conservation buffer phase in, minimum 0.00%  
Capital conservation buffer phase in, maximum 2.50%  
Tier 1 capital to risk-weighted assets [Abstract]    
Actual $ 142,564,000 $ 136,637,000
Actual 142,564,000 136,637,000
For capital adequacy purposes   $ 41,826,000
Risk-weighted assets [Abstract]    
Actual (in hundredths)   14.70%
For capital adequacy purposes (in hundredths)   4.50%
Non Consolidated    
Tier 2 capital to risk-weighted asets [Abstract]    
Actual 151,487,000 $ 144,255,000
For capital adequacy purposes 77,928,000 74,316,000
To be well-capitalized under prompt corrective action provisions 97,410,000 92,895,000
Tier 1 capital to risk-weighted assets [Abstract]    
Actual 141,249,000 134,239,000
For capital adequacy purposes 58,446,000 55,737,000
To be well-capitalized under prompt corrective action provisions 77,928,000 74,316,000
Actual 141,249,000 134,239,000
For capital adequacy purposes 43,835,000 41,803,000
To be well-capitalized under prompt corrective action provisions $ 63,317,000 $ 60,382,000
Risk-weighted assets [Abstract]    
Actual (in hundredths) 15.55% 15.53%
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) 14.50% 14.45%
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) 14.50% 14.45%
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 $ 141,249,000 $ 134,239,000
For capital adequacy purpose 65,437,000 60,885,000
To be well-capitalized under prompt corrective action provisions $ 81,797,000 $ 76,106,000
Average assets [Abstract]    
Actual (in hundredths) 8.63% 8.82%
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 $ 152,802,000 $ 146,653,000
For capital adequacy purposes 77,928,000 74,357,000
Tier 1 capital to risk-weighted assets [Abstract]    
For capital adequacy purposes 58,446,000 $ 55,767,000
For capital adequacy purposes $ 43,835,000  
Risk-weighted assets [Abstract]    
Actual (in hundredths) 15.69% 15.78%
For capital adequacy purposes (in hundredths) 8.00% 8.00%
Actual (in hundredths) 14.64% 14.70%
For capital adequacy purposes (in hundredths) 6.00% 6.00%
Actual (in hundredths) 14.64%  
For capital adequacy purposes (in hundredths) 4.50%  
Tier 1 capital to average assets [Abstract]    
Actual $ 142,564,000 $ 136,637,000
For capital adequacy purpose $ 65,470,000 $ 62,022,000
Average assets [Abstract]    
Actual (in hundredths) 8.71% 8.81%
For capital adequacy purpose (in hundredths) 4.00% 4.00%