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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, 2017 | Dec. 31, 2016
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital to Risk Weighted Assets, Actual Amount | $ 297,708 | $ 261,530
Total Capital to Risk Weighted Assets, Actual Ratio | 14.32% | 14.05%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 192,341 | $ 160,501
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 9.25% | 8.625%
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Amount | $ 228,015 | $ 195,200
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio | 10.97% | 10.49%
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 150,754 | $ 123,283
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 7.25% | 6.625%
Common equity Tier 1 to Risk Weighted Assets, Actual Amount | $ 208,015 | $ 175,200
Common equity Tier 1 to Risk Weighted Assets, Actual Ratio | 10.00% | 9.41%
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 119,563 | $ 95,370
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 5.75% | 5.125%
Tier 1 (Core) Capital to Average Assets, Actual Amount | $ 228,015 | $ 195,200
Tier 1 (Core) Capital to Average Assets, Actual Ratio | 8.45% | 7.85%
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount | $ 107,969 | $ 99,430
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 | $ 279,704 | $ 242,592
Total Capital to Risk Weighted Assets, Actual Ratio | 13.58% | 13.19%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 190,513 | $ 158,590
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 9.25% | 8.625%
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 205,960 | $ 183,873
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 | $ 261,643 | $ 228,109
Tier 1 (Core) Capital to Risk Weighted Assets, Actual Ratio | 12.70% | 12.41%
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 149,321 | $ 121,816
Tier 1 (Core) Capital to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 7.25% | 6.625%
Tier 1 (Core) Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 164,768 | $ 147,098
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 | $ 254,264 | $ 220,730
Common equity Tier 1 to Risk Weighted Assets, Actual Ratio | 12.35% | 12.00%
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Amount | $ 118,427 | $ 94,235
Common equity Tier 1 to Risk Weighted Assets, For Capital Adequacy Purposes Ratio | 5.75% | 5.125%
Common equity Tier 1 to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 133,874 | $ 119,517
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 | $ 261,643 | $ 228,109
Tier 1 (Core) Capital to Average Assets, Actual Ratio | 9.80% | 9.36%
Tier 1 (Core) Capital to Average Assets, For Capital Adequacy Purposes, Amount | $ 106,798 | $ 97,527
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 | $ 133,498 | $ 121,909
Tier 1 (Core) Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 5.00% | 5.00%

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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