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Employee Benefit Plans, Noncontributory Defined Benefit Pension Plan (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Plan	Mar. 31, 2017 USD ($)
Employee Benefit Plans [Abstract]
Number of plans | Plan	2
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost	$ (46)	$ 44
Employer contributions	0
Pension Plan [Member] | Salary and Employee Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	89	91
Pension Plan [Member] | Other Expenses [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	163	167
Expected return on plan assets	(344)	(274)
Net amortization and deferral	$ 46	$ 60

X

- Definition

The net amortization and deferral expenses. The net amortization and deferral component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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- Definition

Refers to the number of plans during the period.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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