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Retirement Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Retirement Benefit Plans [Abstract]
Net actuarial losses related to supplemental retirement plans	$ 439	$ 417
Supplemental executive retirement plans recognized liabilities	3,720	3,874
Net actuarial loss for retirement plan, amortized from accumulated other comprehensive income into net periodic benefit cost	21
Total expense for 401(k) plan	$ 439	$ 411	$ 375

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- Definition

Defined benefit plan, actuarial gain loss related to supplemental retirement plans.

+ References

No definition available.

+ Details

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- Definition

Defined Benefit Plan Supplemental Executive Retirement Plans Recognized Liabilities

+ References

No definition available.

+ Details

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- Definition

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

+ References

No definition available.

+ Details

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- References

No definition available.

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