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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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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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.

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