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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (7,570) | $ (4,092) | $ (3,308)
Income taxes |  |  |  |  |  |  |  |  | (2,640) | (6,360) | (6,619)
Net income | $ 7,569 | $ (3,433) | $ 3,014 | $ 6,989 | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 | 14,139 | 15,872 | 17,217
Comprehensive income |  |  |  |  |  |  |  |  | 14,089 | 17,284 | 15,375
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiaries |  |  |  |  |  |  |  |  | 10,000 |  |
Interest expense |  |  |  |  |  |  |  |  | (1,320) | (1,035) | (884)
Pension expense |  |  |  |  |  |  |  |  | 199 | (925) | (184)
Acquisition expense |  |  |  |  |  |  |  |  | (10,738) |  |
Other expense, net |  |  |  |  |  |  |  |  | (1,740) | (1,071) | (920)
Income (loss) before equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | (3,599) | (3,031) | (1,988)
Income taxes |  |  |  |  |  |  |  |  | 1,751 | 1,407 | 676
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 15,987 | 17,496 | 18,529
Net income |  |  |  |  |  |  |  |  | 14,139 | 15,872 | 17,217
Comprehensive income |  |  |  |  |  |  |  |  | $ 14,089 | $ 17,284 | $ 15,375

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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