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Employee Stock Ownership Plan - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 12, 1998 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 01, 2018 | Apr. 30, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |
Purchase of common stock shares |  | 2,013,137 |  |  |  |
Fixed interest rate |  |  |  |  | 3.25% | 8.25%
Contributions to ESOP |  | $ 1,400 | $ 505 |  |  |
Dividends paid unallocated ESOP shares |  | 287 | 195 |  |  |
Outstanding loan |  | $ 10,400 | $ 3,100 |  |  |
Unallocated shares of ESOP |  | 525,241 | 293,860 |  |  |
Fair value of unallocated shares |  | $ 11,800 |  |  |  |
Shares allocated to participants |  | 2,353,027 |  |  |  |
Shares committed to be released |  | 59,105 |  |  |  |
Minimum |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |
Extended loan term | 12 years |  |  |  |  |
Maximum |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |
Extended loan term | 30 years |  |  |  |  |
Employee Stock Ownership Plan |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |
Minimum age limit for employees to participate in ESOP |  | 21 years |  |  |  |
Minimum number of working hours |  | 1000 hours |  |  |  |
ESOP original borrowings |  | $ 13,400 |  |  |  |
Additional borrowings | $ 8,200 |  |  |  | $ 8,400 |
Additional common stock shares | 633,750 |  |  |  | 292,592 |
Compensation expense related to ESOP |  | 1,618 | $ 919 | $ 657 |  |
Increase in the average fair value |  | $ 596 | $ 637 | $ 373 |  |

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- Definition Employee Minimum Age Eligibility To Participate In Plan + References No definition available. + Details
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- Definition Employee Stock Ownership Plan (ESOP), Number of Unallocated Shares + References No definition available. + Details
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- Definition Employee Stock Ownership Plan ESOP Shares Contributed to ESOP Value + References No definition available. + Details
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- Definition Employee Stock Ownership Plan Esop Debt Structure Direct Loan Interest Percentage + References No definition available. + Details
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- Definition Employee stock ownership plan ESOP minimum work period. + References No definition available. + Details
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- Definition Shares To Be Purchased For Esop From Borrowed Fund + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The amount reported as a liability as of the balance sheet date by the entity (the employer) of the loan made by a third-party lender directly to the ESOP. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16545-113920 + Details
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- Definition Fair value of unearned shares held by the employee stock ownership plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Dividends paid on stock held by an employee stock ownership plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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