Stock-Based Compensation (Restricted Shares) (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 2 months
Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block]	March 31, 2018
Allocated Share-based Compensation Expense	$ 1,208,000	$ 1,086,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 39,000	44,000
Time-Based Vesting \| Restricted Shares
Number of Shares (in shares)
Outstanding at January 1	43,679
Awarded	1,000
Released	0
Forfeited	250
March 31, 2019	44,429
Weighted - Average Grant Date Fair Value (in dollars per share)
Outstanding at January 1	$ 29.64
Awarded	31.92
Released	0.00
Forfeited	31.10
March 31, 2019	$ 29.69
Performance-Based Vesting \| Restricted Shares
Number of Shares (in shares)
Outstanding at January 1	175,772
Awarded	117,200
Released	33,400
Forfeited	141
March 31, 2019	259,431
Weighted - Average Grant Date Fair Value (in dollars per share)
Outstanding at January 1	$ 31.08
Awarded	32.20
Released	17.86
Forfeited	35.43
March 31, 2019	$ 33.29
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 16,000	$ 14,000

Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block]

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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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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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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