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Capital Requirements and Restrictions on Retained Earnings - Summary of Actual and Required Capital Amounts and Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Actual Amount $ 261,530 $ 212,711
Total Capital to Risk Weighted Assets, Actual Ratio 14.05% 13.18%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 160,501 $ 129,135
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 8.625% 8.00%
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Amount $ 195,200 $ 195,974
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio 10.49% 12.14%
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 123,283 $ 96,851
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 6.625% 6.00%
Common equity Tier 1 to Risk Weighted Assets, Actual Amount $ 175,200 $ 175,974
Common equity Tier 1 to Risk Weighted Assets, Actual Ratio 9.41% 10.90%
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 95,370 $ 72,638
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 5.125% 4.50%
Tier 1 (Core) Capital to Average Assets, Actual Amount $ 195,200 $ 195,974
Tier 1 (Core) Capital to Average Assets, Actual Ratio 7.85% 8.73%
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 99,430 $ 89,782
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital to Risk Weighted Assets, Actual Amount $ 242,592 $ 193,301
Total Capital to Risk Weighted Assets, Actual Ratio 13.19% 12.07%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 158,590 $ 128,132
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 8.625% 8.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 183,873 $ 160,166
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Amount $ 228,109 $ 178,353
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio 12.41% 11.14%
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 121,816 $ 96,099
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 6.625% 6.00%
Tier 1 (Core) Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 147,098 $ 128,132
Tier 1 (Core) Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 8.00% 8.00%
Common equity Tier 1 to Risk Weighted Assets, Actual Amount $ 220,730 $ 170,974
Common equity Tier 1 to Risk Weighted Assets, Actual Ratio 12.00% 10.67%
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Amount $ 94,235 $ 72,074
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Ratio 5.125% 4.50%
Common equity Tier 1 to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 119,517 $ 104,108
Common equity Tier 1 to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.50% 6.50%
Tier 1 (Core) Capital to Average Assets, Actual Amount $ 228,109 $ 178,353
Tier 1 (Core) Capital to Average Assets, Actual Ratio 9.36% 8.06%
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 97,527 $ 88,464
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Tier 1 (Core) Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 121,909 $ 110,581
Tier 1 (Core) Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00% 5.00%