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Conversion of issuable stock options to issuable restricted stock ratio.

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ESOP shares purchased expressed as percentage of common stock sold In stock offering.

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Employee stock ownership plan ESOP compensation expense after tax.

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Employee stock ownership plan ESOP period for repayment of loan.

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Loan receivable from ESOP.

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Number of issuable stock options converted into restricted stock units.

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Number of restricted stock units converted from issuable stock options.

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Number of shares available for grant conversion of issuable stock options to issuable restricted stock.

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Share based compensation arrangement by share based payment award grants in period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of cost for defined contribution plan.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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An entity often discloses the amount of interest paid by the ESOP to a lender.

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An entity will typically disclose the amount of any repurchase obligation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Compensation and Benefit Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compensation And Benefit Plans Disclosure [Line Items]
Fair value of pension plan assets	$ 14,416	$ 14,732	$ 15,038
401(k) expenses	$ 363	$ 317	339
Maximum employer matching contribution percentage	4.00%
Number of ESOP shares purchased		723,751
Compensation expense	$ 615	$ 526
Interest on ESOP loan	$ 175	52
Number of option grants	163,766
Exercise price for options	$ 12.77
Weighted average remaining contractual life	6 years 6 months
Numbre of shares exercisable	0
Stock Options
Compensation And Benefit Plans Disclosure [Line Items]
Compensation expense	$ 7
Restricted Stock Units
Compensation And Benefit Plans Disclosure [Line Items]
Number of stock grants	510,879
Compensation expense	$ 91
2018 Long-Term Incentive Plan
Compensation And Benefit Plans Disclosure [Line Items]
Equity incentive plans, maximum number of shares issuable	1,248,469
Common stock reserved for future issuance	1,248,469
Conversion of issuable stock options to issuable restricted stock ratio	3.0
Number of issuable stock options converted into restricted stock units	462,522
Number of restricted stock units converted from issuable stock options	154,174
Number of grants	674,645
Conversion of issuable stock options to issuable restricted stock	88,492
2018 Long-Term Incentive Plan \| Directors
Compensation And Benefit Plans Disclosure [Line Items]
Vesting percentage	20.00%
Vesting period	10 years
2018 Long-Term Incentive Plan \| Executive Officers
Compensation And Benefit Plans Disclosure [Line Items]
Vesting percentage	20.00%
2018 Long-Term Incentive Plan \| Stock Options
Compensation And Benefit Plans Disclosure [Line Items]
Common stock reserved for future issuance	891,764
Shares available for future awards	265,476
2018 Long-Term Incentive Plan \| Restricted Stock Units
Compensation And Benefit Plans Disclosure [Line Items]
Common stock reserved for future issuance	356,705
Shares available for future awards	0
2018 Long-Term Incentive Plan \| Restricted Stock Units \| Executive Officers
Compensation And Benefit Plans Disclosure [Line Items]
Number of stock grants	322,254
2018 Long-Term Incentive Plan \| Restricted Stock Units \| Outside Directors
Compensation And Benefit Plans Disclosure [Line Items]
Number of stock grants	148,625
2018 Long-Term Incentive Plan \| Restricted Stock Units \| Officers
Compensation And Benefit Plans Disclosure [Line Items]
Number of stock grants	40,000
2018 Long-Term Incentive Plan \| Incentive Options \| Executive Officers
Compensation And Benefit Plans Disclosure [Line Items]
Number of option grants	119,176
2018 Long-Term Incentive Plan \| Non-qualified Options \| Outside Directors
Compensation And Benefit Plans Disclosure [Line Items]
Number of option grants	44,590
Supplemental Executive Retirement Plan
Compensation And Benefit Plans Disclosure [Line Items]
Expense recognized	$ 61	166	$ 0
Employee Stock Ownership Plan
Compensation And Benefit Plans Disclosure [Line Items]
ESOP borrowed amount	$ 7,238
Number of ESOP shares purchased	723,751
ESOP shares purchased expressed as percentage of common stock sold in stock offering	3.92%
Expected period of loan repaid	15 years
Loan receivable - ESOP	$ 6,308	6,712
Fair Value Measurements
Compensation And Benefit Plans Disclosure [Line Items]
Fair value of pension plan assets	$ 14,416	$ 14,696