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Parent Company Only Condensed Financial Information - Schedule of Condensed Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (3,308) | $ (3,309) | $ (4,104)
Income tax benefit |  |  |  |  |  |  |  |  | 6,619 | 4,781 | 3,162
Net income | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | $ 3,199 | $ 3,253 | $ 3,122 | $ 3,171 | 17,217 | 12,745 | 9,528
Comprehensive income |  |  |  |  |  |  |  |  | 15,375 | 12,297 | 13,728
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiaries |  |  |  |  |  |  |  |  |  | 14,226 | 7,339
Interest expense |  |  |  |  |  |  |  |  | (884) | (760) | (777)
Pension expense |  |  |  |  |  |  |  |  | (184) | (388) | (397)
Other expense, net |  |  |  |  |  |  |  |  | (920) | (1,755) | (1,150)
Income (loss) before equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | (1,988) | 11,323 | 5,015
Income tax benefit |  |  |  |  |  |  |  |  | 676 | 959 | 763
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 18,529 | 463 | 3,750
Net income |  |  |  |  |  |  |  |  | 17,217 | 12,745 | 9,528
Comprehensive income |  |  |  |  |  |  |  |  | $ 15,375 | $ 12,297 | $ 13,728

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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