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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (3,309) | $ (4,104) | $ (4,907)
Income tax benefit |  |  |  |  |  |  |  |  | 4,781 | 3,162 | 1,373
Net income | $ 3,199 | $ 3,253 | $ 3,122 | $ 3,171 | $ 2,270 | $ 2,306 | $ 2,240 | $ 2,712 | 12,745 | 9,528 | 6,179
Comprehensive income |  |  |  |  |  |  |  |  | 12,297 | 13,728 | 3,579
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiaries |  |  |  |  |  |  |  |  | 14,226 | 7,339 | 7,888
Interest expense |  |  |  |  |  |  |  |  | (760) | (777) | (740)
Pension expense |  |  |  |  |  |  |  |  | (388) | (397) | (4,072)
Other expense, net |  |  |  |  |  |  |  |  | (1,755) | (1,150) | (952)
Income before equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 11,323 | 5,015 | 2,124
Income tax benefit |  |  |  |  |  |  |  |  | 959 | 763 | 1,960
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 463 | 3,750 | 2,095
Net income |  |  |  |  |  |  |  |  | 12,745 | 9,528 | 6,179
Comprehensive income |  |  |  |  |  |  |  |  | $ 12,297 | $ 13,728 | $ 3,579

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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=36458714&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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