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Stock-Based Compensation Plans (Summary of Activity Related to Share Based Awards) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares
Restricted Stock Units (RSUs) [Member] |
Number of Shares |
Nonvested, beginning | shares | 30,225
Granted | shares | 15,138
Vested | shares | (6,854)
Forfeited | shares | (2,457)
Nonvested, ending | shares | 36,052
Weighted Average Grant Date Fair Value |
Nonvested, beginning | $ / shares | $ 44.23
Granted | $ / shares | 43.40
Vested | $ / shares | 44.12
Forfeited | $ / shares | 43.99
Nonvested, ending | $ / shares | $ 43.92
Weighted-Average Remaining Contractual Term (Years) |
Nonvested, weighted average remaining contractual term | 3 years 3 months 30 days
Aggregate Intrinsic Value |
Nonvested, aggregate intrinsic value | $ | $ 1,661
Unrecognized Compensation |
Nonvested, unrecognized compensation | $ | $ 1,258
Restricted Stock [Member] |
Number of Shares |
Nonvested, beginning | shares | 22,781
Granted | shares | 16,347
Vested | shares | (19,420)
Forfeited | shares | (421)
Nonvested, ending | shares | 19,287
Weighted Average Grant Date Fair Value |
Nonvested, beginning | $ / shares | $ 38.21
Granted | $ / shares | 44.30
Vested | $ / shares | 40.16
Forfeited | $ / shares | 27.20
Nonvested, ending | $ / shares | $ 41.66
Weighted-Average Remaining Contractual Term (Years) |
Nonvested, weighted average remaining contractual term | 1 year 7 months
Aggregate Intrinsic Value |
Nonvested, aggregate intrinsic value | $ | $ 888
Unrecognized Compensation |
Nonvested, unrecognized compensation | $ | $ 492
Management Stock Purchase Plan [Member] |
Number of Shares |
Nonvested, beginning | shares | 13,013
Granted | shares | 7,741
Vested | shares | (5,516)
Forfeited | shares | (223)
Nonvested, ending | shares | 15,015
Weighted Average Grant Date Fair Value |
Nonvested, beginning | $ / shares | $ 14.35
Granted | $ / shares | 11.01
Vested | $ / shares | 13.65
Forfeited | $ / shares | 14.23
Nonvested, ending | $ / shares | $ 12.89
Weighted-Average Remaining Contractual Term (Years) |
Nonvested, weighted average remaining contractual term | 8 months
Aggregate Intrinsic Value |
Nonvested, aggregate intrinsic value | $ | $ 219
Unrecognized Compensation |
Nonvested, unrecognized compensation | $ | $ 57
Performance Shares [Member] |
Number of Shares |
Nonvested, beginning | shares | 26,377
Granted | shares | 14,186
Vested | shares | (7,811)
Forfeited | shares | (4,987)
Nonvested, ending | shares | 27,765
Weighted Average Grant Date Fair Value |
Nonvested, beginning | $ / shares | $ 44.28
Granted | $ / shares | 43.98
Vested | $ / shares | 43.99
Forfeited | $ / shares | 43.99
Nonvested, ending | $ / shares | $ 44.26
Weighted-Average Remaining Contractual Term (Years) |
Nonvested, weighted average remaining contractual term | 1 year 7 months 12 days
Aggregate Intrinsic Value |
Nonvested, aggregate intrinsic value | $ | $ 1,279
Unrecognized Compensation |
Nonvested, unrecognized compensation | $ | $ 455
DCRP Awards [Member] |
Number of Shares |
Nonvested, beginning | shares | 9,970
Granted | shares | 3,542
Vested | shares | (2,861)
Forfeited | shares | 0
Nonvested, ending | shares | 10,651
Weighted Average Grant Date Fair Value |
Nonvested, beginning | $ / shares | $ 28.16
Granted | $ / shares | 43.26
Vested | $ / shares | 35.74
Forfeited | $ / shares | 0.00
Nonvested, ending | $ / shares | $ 31.14
Weighted-Average Remaining Contractual Term (Years) |
Nonvested, weighted average remaining contractual term | 10 years 3 months 12 days
Aggregate Intrinsic Value |
Nonvested, aggregate intrinsic value | $ | $ 491
Unrecognized Compensation |
Nonvested, unrecognized compensation | $ | $ 255

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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