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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule Of Regulatory Assets And Liabilities [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 267,414 | $ 264,452
Total capital (to risk-weighted assets), Actual, Ratio | 12.56% | 13.99%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 183,703 | $ 151,223
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.63% | 8.00%
Tier 1 capital (to average assets), Actual, Amount | $ 253,188 | $ 249,918
Tier 1 capital (to average assets), Actual, Ratio | 11.89% | 13.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 141,130 | $ 113,427
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.63% | 6.00%
Common equity tier 1 capital, Actual Amount | $ 220,120 | $ 249,918
Common equity tier 1 capital, Actual Ratio | 10.34% | 13.22%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 109,200 | $ 113,427
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 5.13% | 6.00%
Tier 1 capital (to average assets), Actual, Amount | $ 253,188 | $ 249,918
Tier 1 capital (to average assets), Actual, Ratio | 9.55% | 9.82%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 106,069 | $ 101,800
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Bank [Member] |  |
Schedule Of Regulatory Assets And Liabilities [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 257,203 | $ 237,348
Total capital (to risk-weighted assets), Actual, Ratio | 12.45% | 12.57%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 178,286 | $ 151,057
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.63% | 8.00%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount | $ 206,589 | $ 188,821
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio | 10.00% | 10.00%
Tier 1 capital (to average assets), Actual, Amount | $ 242,977 | $ 222,814
Tier 1 capital (to average assets), Actual, Ratio | 11.77% | 11.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 136,868 | $ 113,295
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.63% | 6.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 165,150 | $ 151,060
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 242,977 | $ 222,814
Common equity tier 1 capital, Actual Ratio | 11.77% | 11.80%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 105,902 | $ 113,295
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 5.13% | 6.00%
Common equity tier 1 capital, For well capitalized purpose, Amount | $ 134,184 | $ 151,060
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 8.00%
Tier 1 capital (to average assets), Actual, Amount | $ 242,977 | $ 222,814
Tier 1 capital (to average assets), Actual, Ratio | 9.18% | 8.77%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 105,872 | $ 101,626
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 132,340 | $ 127,032
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 5.00% | 5.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum amount of Total Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: 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=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total 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=35709795&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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: 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=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as 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 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + 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=35709795&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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: 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=35709795&loc=SL5958568-112826 + Details
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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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958568-112826 + Details
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