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Merger - Schedule of Financial Information for Former UCB Included in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Net interest income after provision for loan losses |  | $ 15,434 | $ 13,680 | $ 44,972 | $ 39,939
Noninterest income |  | 3,288 | 3,465 | 13,293 | 12,704
Net income (loss) |  | $ (3,433) | $ 3,660 | $ 6,570 | $ 11,892
Former UCB [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net interest income after provision for loan losses | $ 432 |  |  |  |
Noninterest income | 7 |  |  |  |
Net income (loss) | $ 298 |  |  |  |

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- Definition Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.12) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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