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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Total capital to risk weighted assets:    
Total capital to risk weighted assets, Actual Amount $ 410,831 $ 316,314
Total capital to risk weighted assets, Actual Ratio ( as a percentage) 15.98% 13.28%
Total capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Amount $ 205,661 $ 190,257
Total capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 8.00% 8.00%
Tier 1 capital to risk weighted assets:    
Tier 1 capital to risk weighted assets, Actual Amount $ 392,520 $ 304,324
Tier 1 capital to risk weighted assets, Actual Ratio ( as a percentage) 15.27% 12.78%
Tier 1 capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Amount $ 154,246 $ 142,895
Tier 1 capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 6.00% 6.00%
Common Equity Tier 1 (CET1) to risk weighted assets:    
Common Equity Tier 1 (CET1) to risk weighted, Actual Amount $ 353,995 $ 266,760
Common Equity Tier 1 (CET1) to risk weighted, Actual Ratio ( as a percentage) 13.77% 11.20%
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount Required for Adequately Capitalized Amount $ 115,684 $ 107,171
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 4.50% 4.50%
Tier 1 capital to average assets:    
Tier 1 capital to average, Actual Amount $ 392,520 $ 304,324
Tier 1 capital to average, Actual Ratio ( as a percentage) 12.25% 10.07%
Tier 1 capital to average, Minimum Amount Required for Adequately Capitalized Amount $ 128,178 $ 120,850
Tier 1 capital to average, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 4.00% 4.00%
Bank    
Total capital to risk weighted assets:    
Total capital to risk weighted assets, Actual Amount $ 367,972 $ 325,465
Total capital to risk weighted assets, Actual Ratio ( as a percentage) 14.28% 13.61%
Total capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Amount $ 206,083 $ 191,267
Total capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 8.00% 8.00%
Total capital to risk weighted assets, Minimum Amount To Be Well Capitalized Amount $ 257,604 $ 239,084
Total capital to risk weighted assets, Minimum Amount To Be Well Capitalized Ratio (as a percentage) 10.00% 10.00%
Tier 1 capital to risk weighted assets:    
Tier 1 capital to risk weighted assets, Actual Amount $ 349,662 $ 313,474
Tier 1 capital to risk weighted assets, Actual Ratio ( as a percentage) 13.57% 13.11%
Tier 1 capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Amount $ 154,562 $ 143,450
Tier 1 capital to risk weighted assets, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 6.00% 6.00%
Tier 1 capital to risk weighted assets, Minimum Amount To Be Well Capitalized Amount $ 206,083 $ 191,267
Tier 1 capital to risk weighted assets, Minimum Amount To Be Well Capitalized Ratio (asa percentage) 8.00% 8.00%
Common Equity Tier 1 (CET1) to risk weighted assets:    
Common Equity Tier 1 (CET1) to risk weighted, Actual Amount $ 349,662 $ 313,474
Common Equity Tier 1 (CET1) to risk weighted, Actual Ratio ( as a percentage) 13.57% 13.11%
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount Required for Adequately Capitalized Amount $ 115,922 $ 107,588
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 4.50% 4.50%
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount To Be Well Capitalized Amount $ 167,442 $ 155,404
Common Equity Tier 1 (CET1) to risk weighted, Minimum Amount To Be Well Capitalized Ratio (as a percentage) 6.50% 6.50%
Tier 1 capital to average assets:    
Tier 1 capital to average, Actual Amount $ 349,662 $ 313,474
Tier 1 capital to average, Actual Ratio ( as a percentage) 10.89% 10.35%
Tier 1 capital to average, Minimum Amount Required for Adequately Capitalized Amount $ 128,409 $ 121,169
Tier 1 capital to average, Minimum Amount Required for Adequately Capitalized Ratio ( as a percentage) 4.00% 4.00%
Tier 1 capital to average, Minimum Amount To Be Well Capitalized Amount $ 160,511 $ 151,461
Tier 1 capital to average, Minimum Amount To Be Well Capitalized Ratio ( as a percentage) 5.00% 5.00%