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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ (12,954) | $ (7,570) | $ (4,092)
Income tax expense |  |  |  |  |  |  |  |  | (5,683) | (2,640) | (6,360)
Net income | $ 7,841 | $ 7,708 | $ 8,660 | $ 9,669 | $ 7,569 | $ (3,433) | $ 3,014 | $ 6,989 | 33,878 | 14,139 | 15,872
Comprehensive income |  |  |  |  |  |  |  |  | 42,204 | 14,089 | 17,284
CBI[Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from bank subsidiaries |  |  |  |  |  |  |  |  | 13,300 | 10,000 |
Interest expense |  |  |  |  |  |  |  |  | (1,423) | (1,320) | (1,035)
Pension expense |  |  |  |  |  |  |  |  | 176 | 199 | (925)
Acquisition expense |  |  |  |  |  |  |  |  |  | (10,738) |
Other expense, net |  |  |  |  |  |  |  |  | (1,107) | (1,740) | (1,071)
Income (loss) before equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 10,946 | (3,599) | (3,031)
Income tax expense |  |  |  |  |  |  |  |  | 494 | 1,751 | 1,407
Equity in undistributed net earnings of subsidiaries |  |  |  |  |  |  |  |  | 22,438 | 15,987 | 17,496
Net income |  |  |  |  |  |  |  |  | 33,878 | 14,139 | 15,872
Comprehensive income |  |  |  |  |  |  |  |  | $ 42,204 | $ 14,089 | $ 17,284

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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=116868678&loc=d3e1043-128460 + Details
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