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Employee Benefit Plans (Summary of the Activity in the SERP's Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Benefit obligation:
Balance, January 1	$ 98,790	$ 85,551
Service cost	4,017	3,733
Interest cost	3,703	3,621
Benefits paid	(2,341)	(2,031)
Actuarial (gain) loss	(7,768)	7,916
Balance, December 31	96,401	98,790	$ 85,551
Supplemental Executive Retirement Plan [Member]
Benefit obligation:
Balance, January 1	10,094	9,132
Service cost	92	143	133
Interest cost	348	360	367
Benefits paid	(260)	(247)	(247)
Actuarial (gain) loss	(177)	706
Balance, December 31	$ 10,097	$ 10,094	$ 9,132

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
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- Definition

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

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- Definition

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

+ References

No definition available.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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- Definition

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

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