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Defined Benefit Plan, Annual Vesting Percentage

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Defined Benefit Plan, Benefit Obligation, Percent Of Average Executive Base Salary

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Defined Benefit Plan, Benefit Obligation, Percent Of Average Executive Base Salary, Adjustment Thereafter

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- Definition

Defined Benefit Plan, Number of Annual Payments After Separation

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Defined Benefit Plan, Payment Term After Separation

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- Definition

Interest paid on deferred fees

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Exercised Forfeited Or Expired Number

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Share Based Compensation Arrangement By ShareBased Payment Award Award Expiration Period

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- Definition

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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- Definition

Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

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Amount of distribution made to individual in accordance with deferred compensation arrangement.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

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

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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- Definition

Description of defined contribution pension and other postretirement plans. Includes, but is not limited to, plan utilized, employee group covered, and employer matching contributions.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method.

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Period expense related to postemployment benefits.

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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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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.

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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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- Definition

Number of options outstanding, including both vested and non-vested options.

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Percentage of vesting of share-based compensation awards.

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Employee Benefit Plans - Narrative (Details)	3 Months Ended
Employee Benefit Plans - Narrative (Details)	Mar. 31, 2019 USD ($) payment shares	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, outstanding (in shares) \| shares	614,411		584,178
Defined contribution plan, maximum annual contributions per employee, percent	80.00%
Defined contribution plan employer discretionary contribution amount	$ 146,000	$ 136,000
Deferred fees	312,000	250,000
Interest paid on deferred fees	23,000	15,000
Distributions paid	$ 3,000	0
Description of defined contribution pension and other postretirement plans	Upon separation from service after age 66, the President and CEO will be entitled to an annual benefit in the amount of $156,000 payable in fifteen annual installments subject to annual 2% increases.
Defined benefit plans future payments	$ 2,823,000	1,312,000	$ 2,747,000	$ 1,187,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage	100.00%
Executive Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage	100.00%
Supplemental Employee Retirement Plan \| President And Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service	60.00%
Defined Benefit Plan, Payment Term After Separation	36 months
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service, adjustment thereafter	2.00%
Number of annual payments after separation \| payment	15
Defined benefit plans future payments	$ 5,500,000
Discount rate used to calculate the present value of the benefit obligation	4.00%
Vesting percentage	3.00%
Award vesting rights, percentage	100.00%
Other Postretirement Benefit Plan \| Executive Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage	7.50%
Award vesting rights, percentage	100.00%
Accrued expense under the plan	$ 25,000
Life insurance plan with a post retirement death benefit	250,000
Life insurance plan aggregate expenses	$ 1,000	$ 1,000
Other Postretirement Benefit Plan \| Executive Management \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage	15.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Options, award expiration period	10 years
Number of shares authorized \| shares	2,462,585
Options, outstanding (in shares) \| shares	614,411
Options, exercised forfeited or expired (shares) \| shares	1,712,036
Number of shares available for grant \| shares	136,138
Compensation cost not yet recognized	$ 1,300,000
Compensation cost recognition weighted average period	2 years 4 months 24 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Number of shares authorized \| shares	518,157
Number of shares available for grant \| shares	36,678
Compensation cost recognition weighted average period	3 years
Nonvested awards, compensation not yet recognized, awards other than options	$ 1,700,000