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Regulatory Capital Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Regulatory Capital Requirements [Line Items]    
Leverage - For capital adequacy purposes Ratio 4.00%  
Common Equity Tier 1 Capital - For capital adequacy purposes Ratio 4.50%  
Tier 1 Capital - For capital adequacy purposes Ratio 6.00%  
Total Risk Based Capital - For capital adequacy purposes Ratio 8.00%  
Banks Regulatory Capital Requirements [Member]    
Regulatory Capital Requirements [Line Items]    
Leverage - Actual Amount $ 95,263 $ 86,808
Common Equity Tier 1 Capital - Actual Amount 95,263 86,808
Tier 1 Capital - Actual Amount 95,263 86,808
Total Risk Based Capital - Actual Amount $ 101,292 $ 92,407
Leverage - Actual Ratio 10.05% 9.62%
Common Equity Tier 1 Capital - Actual Ratio 16.24% 16.35%
Tier 1 Capital - Actual Ratio 16.24% 16.35%
Total Risk Based Capital - Actual Ratio 17.27% 17.40%
Leverage - For capital adequacy purposes Amount $ 37,927 $ 36,097
Common Equity Tier 1 Capital - For capital adequacy purposes Amount 37,395 30,529
Tier 1 Capital - For capital adequacy purposes Amount 46,194 38,493
Total Risk Based Capital - For capital adequacy purposes Amount $ 57,926 $ 49,112
Leverage - For capital adequacy purposes Ratio [1] 4.00% 4.00%
Common Equity Tier 1 Capital - For capital adequacy purposes Ratio [1] 6.40% 5.80%
Tier 1 Capital - For capital adequacy purposes Ratio [1] 7.90% 7.30%
Total Risk Based Capital - For capital adequacy purposes Ratio [1] 9.90% 9.30%
Leverage - To be well-capitalized under prompt corrective action provisions Amount $ 47,408 $ 45,122
Common Equity Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Amount 38,129 34,511
Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Amount 46,928 42,475
Total Risk Based Capital - To be well-capitalized under prompt corrective action provisions Amount $ 58,659 $ 53,094
Leverage - To be well-capitalized under prompt corrective action provisions Ratio 5.00% 5.00%
Common Equity Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Ratio 6.50% 6.50%
Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Ratio 8.00% 8.00%
Total Risk Based Capital - To be well-capitalized under prompt corrective action provisions Ratio 10.00% 10.00%
[1] The required ratios for capital adequacy purposes include a capital conservation buffer of 1.875% for September 30, 2018 and 1.25% for December 31, 2017