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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Common equity tier 1 capital to risk weighted assets    
Actual $ 216,215 $ 207,597
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 155,231 $ 142,444
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 9.75% 9.29%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 7.00% 6.375%
Total capital to risk weighted assets, Amount    
Actual at period end $ 292,151 $ 282,126
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 232,922 $ 220,648
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 13.17% 12.63%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 10.50% 9.875%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 272,840 $ 263,125
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 188,548 $ 175,960
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.30% 11.78%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 8.50% 7.875%
Tier 1 capital to average assets, Amount    
Actual $ 272,840 $ 263,125
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 104,536 $ 104,415
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.44% 10.08%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 4.00% 4.00%
Subsidiaries [Member]    
Common equity tier 1 capital to risk weighted assets    
Actual $ 300,290 $ 295,599
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 154,561 141,791
Minimum Required to Be Well Capitalized $ 143,521 $ 144,571
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 13.60% 13.29%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 7.00% 6.375%
Minimum Required to Be Well Capitalized (as a percent) 6.50% 6.50%
Total capital to risk weighted assets, Amount    
Actual at period end $ 319,601 $ 314,600
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 231,915 219,637
Minimum Required to Be Well Capitalized $ 220,871 $ 222,417
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 14.47% 14.14%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 10.50% 9.875%
Minimum Required to Be Well Capitalized (as a percent) 10.00% 10.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 300,290 $ 295,599
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 187,681 175,153
Minimum Required to Be Well Capitalized $ 176,641 $ 177,934
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 13.60% 13.29%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 8.50% 7.875%
Minimum Required to Be Well Capitalized (as a percent) 8.00% 8.00%
Tier 1 capital to average assets, Amount    
Actual $ 300,290 $ 295,599
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 104,087 104,084
Minimum Required to Be Well Capitalized $ 130,108 $ 130,105
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 11.54% 11.36%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 4.00% 4.00%
Minimum Required to Be Well Capitalized (as a percent) 5.00% 5.00%