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Employee Benefit Plans - Options Outstanding by Exercise Price Range (Details) - Officer and Employee Plans [Member] - $ / shares	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 10.13	$ 10.29
Number Outstanding (in shares)	121,800	136,658
Options Outstanding, Weighted Average Remaining Life	3 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.13
Options Exercisable, Number Exercisable (in shares)	121,800
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.13
6.60 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 6.60
Number Outstanding (in shares)	25,000
Options Outstanding, Weighted Average Remaining Life	1 year 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.60
Options Exercisable, Number Exercisable (in shares)	25,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.60
6.80 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 6.80
Number Outstanding (in shares)	13,250
Options Outstanding, Weighted Average Remaining Life	10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.80
Options Exercisable, Number Exercisable (in shares)	13,250
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.80
9.48 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 9.48
Number Outstanding (in shares)	21,000
Options Outstanding, Weighted Average Remaining Life	2 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.48
Options Exercisable, Number Exercisable (in shares)	21,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.48
9.60 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 9.60
Number Outstanding (in shares)	28,250
Options Outstanding, Weighted Average Remaining Life	3 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.60
Options Exercisable, Number Exercisable (in shares)	28,250
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.60
11.67 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 11.76
Number Outstanding (in shares)	2,266
Options Outstanding, Weighted Average Remaining Life	2 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.76
Options Exercisable, Number Exercisable (in shares)	2,266
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.76
15.05 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 15.05
Number Outstanding (in shares)	32,034
Options Outstanding, Weighted Average Remaining Life	5 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.05
Options Exercisable, Number Exercisable (in shares)	32,034
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.05

X

- Definition

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.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

+ 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
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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No definition available.

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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-Publisher FASB
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- Definition

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

+ References

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