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Regulatory Capital - Summary of Regulatory Capital Requirement (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 | $ 384,800 | $ 316,576
Total capital (to risk-weighted assets), Actual, Ratio | 12.91% | 13.87%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 238,543 | $ 182,596
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 275,816 | $ 196,976
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 9.25% | 8.63%
Tier 1 capital (to average assets), Actual, Amount | $ 368,355 | $ 301,739
Tier 1 capital (to average assets), Actual, Ratio | 12.35% | 13.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 178,907 | $ 136,947
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.00% | 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 216,180 | $ 151,326
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.25% | 6.63%
Common equity tier 1 capital, Actual Amount | $ 329,892 | $ 263,313
Common equity tier 1 capital, Actual Ratio | 11.06% | 11.50%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 134,181 | $ 103,036
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 4.50% | 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 171,454 | $ 117,460
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 5.75% | 5.13%
Tier 1 capital (to average assets), Actual, Amount | $ 368,355 | $ 301,739
Tier 1 capital (to average assets), Actual, Ratio | 9.92% | 10.44%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 148,503 | $ 115,609
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 148,503 | $ 115,609
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, 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 | $ 382,788 | $ 319,013
Total capital (to risk-weighted assets), Actual, Ratio | 12.85% | 13.98%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 238,386 | $ 182,541
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 275,634 | $ 196,916
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 9.25% | 8.63%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount | $ 297,982 | $ 228,176
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio | 10.00% | 10.00%
Tier 1 capital (to average assets), Actual, Amount | $ 366,343 | $ 304,176
Tier 1 capital (to average assets), Actual, Ratio | 12.29% | 13.33%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 178,790 | $ 136,905
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.00% | 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 216,038 | $ 151,280
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.25% | 6.63%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 238,386 | $ 182,540
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 366,343 | $ 304,176
Common equity tier 1 capital, Actual Ratio | 12.29% | 13.33%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 134,092 | $ 102,679
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 4.50% | 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 171,340 | $ 117,054
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 5.75% | 5.13%
Common equity tier 1 capital, For well capitalized purpose, Amount | $ 193,689 | $ 148,314
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 366,343 | $ 304,176
Tier 1 capital (to average assets), Actual, Ratio | 9.89% | 9.93%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 148,116 | $ 122,521
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 148,116 | $ 122,521
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 185,145 | $ 153,151
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=84167132&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=84167132&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=84167132&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=84167132&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=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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&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=84167132&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=84167132&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=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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&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=84167132&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital 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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- Definition Tier 1 Risk Based Capital as defined in the regulations. + 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital 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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- 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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