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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 common equity, (to risk-weighted assets), Actual Amount   $ 100,839  
Tier 1 common equity, (to risk-weighted assets), Actual Ratio (as a percent)   10.10%  
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount   $ 44,881  
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)   4.50%  
Capital   $ 122,190 $ 101,033
Capital to Risk Weighted Assets   12.30% 13.80%
Capital Required for Capital Adequacy   $ 79,789 $ 58,777
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00% 8.00%
Tier 1 capital (to risk-weighted assets), Actual Amount   $ 100,839 $ 92,233
Tier 1 capital (to risk-weighted assets), Actual Ratio (as a percent)   10.10% 12.60%
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount   $ 59,842 $ 29,388
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)   6.00% 4.00%
Tier 1 capital (to average assets), Actual Amount   $ 100,839 $ 92,233
Tier 1 capital (to average assets), Actual Ratio (as a percent)   8.30% 9.90%
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount   $ 48,713 $ 37,381
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)   4.00% 4.00%
Bank      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 common equity, (to risk-weighted assets), Actual Amount   $ 104,434  
Tier 1 common equity, (to risk-weighted assets), Actual Ratio (as a percent)   10.50%  
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount   $ 44,768  
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)   4.50%  
Tier One Common Equity Required to be Well Capitalized   $ 64,664  
Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets   6.50%  
Capital   $ 112,785 $ 89,177
Capital to Risk Weighted Assets   11.30% 12.20%
Capital Required for Capital Adequacy   $ 79,587 $ 58,600
Capital Required for Capital Adequacy to Risk Weighted Assets   8.00% 8.00%
Capital Required to be Well Capitalized   $ 99,484 $ 73,250
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00% 10.00%
Tier 1 capital (to risk-weighted assets), Actual Amount   $ 104,434 $ 83,377
Tier 1 capital (to risk-weighted assets), Actual Ratio (as a percent)   10.50% 11.40%
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount   $ 59,690 $ 29,300
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent)   6.00% 4.00%
Tier 1 capital (to risk-weighted assets), Minimum to be Wel Capitalized Under Prompt Corrective Actions, Amount   $ 79,587 $ 43,950
Tier 1 capital (to risk-weighted assets), Minimum to be Wel Capitalized Under Prompt Corrective Actions, Ratio (as a percent)   8.00% 6.00%
Tier 1 capital (to average assets), Actual Amount   $ 104,434 $ 83,377
Tier 1 capital (to average assets), Actual Ratio (as a percent)   8.60% 8.90%
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount   $ 48,636 $ 37,303
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent)   4.00% 4.00%
Tier 1 capital (to average assets), Minimum to be Well Capitalized Under Prompt Corrective Actions, Amount   $ 60,796 $ 46,629
Tier 1 capital (to average assets), Minimum to be Well Capitalized Under Prompt Corrective Actions, Ratio (as a percent)   5.00% 5.00%
Scenario, Forecast      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount $ 69,815    
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 7.00%    
Capital Required for Capital Adequacy $ 104,723    
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50%    
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount $ 84,776    
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 8.50%    
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount $ 48,713    
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent) 4.00%    
Scenario, Forecast | Bank      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Actual Amount $ 69,639    
Tier 1 common equity, (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 7.00%    
Capital Required for Capital Adequacy $ 104,458    
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50%    
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Amount $ 84,561    
Tier 1 capital (to risk-weighted assets), Minimum Capital Requirement, Ratio (as a percent) 8.50%    
Tier 1 capital (to average assets), Minimum Capital Requirement, Amount $ 48,636    
Tier 1 capital (to average assets), Minimum Capital Requirement, Ratio (as a percent) 4.00%