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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (4,092) | $ (3,308) | $ (3,309)
Income tax benefit |  |  |  |  |  |  |  |  | (6,360) | (6,619) | (4,781)
Net income | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | 15,872 | 17,217 | 12,745
Comprehensive income |  |  |  |  |  |  |  |  | 17,284 | 15,375 | 12,297
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiaries |  |  |  |  |  |  |  |  |  |  | 14,226
Interest expense |  |  |  |  |  |  |  |  | (1,035) | (884) | (760)
Pension expense |  |  |  |  |  |  |  |  | (925) | (184) | (388)
Other expense, net |  |  |  |  |  |  |  |  | (1,071) | (920) | (1,755)
Income (loss) before equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | (3,031) | (1,988) | 11,323
Income tax benefit |  |  |  |  |  |  |  |  | 1,407 | 676 | 959
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 17,496 | 18,529 | 463
Net income |  |  |  |  |  |  |  |  | 15,872 | 17,217 | 12,745
Comprehensive income |  |  |  |  |  |  |  |  | $ 17,284 | $ 15,375 | $ 12,297

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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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: 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 Reference 2: 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 3: 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=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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