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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Banking And Thrift [Abstract]    
CET1 capital to risk-weighted assets, amount $ 63,455 $ 60,631
Tier 1 capital to risk-weighted assets, amount 68,455 65,631
Total capital to risk-weighted assets, amount 73,116 70,583
Tier 1 capital to average assets, amount $ 68,455 $ 65,631
CET1 capital to risk-weighted assets, ratio 12.37% 12.97%
Tier 1 capital to risk-weighted assets, ratio 13.35% 14.04%
Total capital to risk-weighted assets, ratio 14.26% 15.10%
Tier 1 capital to average assets, ratio 10.77% 10.46%
CET1 capital to risk-weighted assets, amount for capital adequacy purposes $ 23,082 $ 21,033
Tier 1 capital to risk-weighted assets, amount for capital adequacy purposes 30,776 28,044
Total capital to risk-weighted assets, amount for capital adequacy purposes 41,033 37,392
Tier 1 capital to average assets, amount for capital adequacy purposes $ 25,416 $ 25,086
CET1 capital to risk-weighted assets, ratio for capital adequacy purposes 4.50% 4.50%
Tier 1 capital to risk-weighted assets, ratio for capital adequacy purposes 6.00% 6.00%
Total capital to risk-weighted assets, ratio for capital adequacy purposes 8.00% 8.00%
Tier 1 capital to average assets, ratio for capital adequacy purposes 4.00% 4.00%