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Guarantees and Commitments (Narrative) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) Property	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitments Contingencies And Guarantees [Line Items]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure		$ 201,749,000	$ 157,338,000
Fixed asset acquisition commitments settlement payment date	2017-07
Harrisburg, PA [Member] | Commercial Building [Member]
Commitments Contingencies And Guarantees [Line Items]
Fixed asset acquisition commitments	$ 2,100,000
Harrisburg, PA [Member] | Vacant and Undeveloped Lots Adjacent to Commercial Building [Member]
Commitments Contingencies And Guarantees [Line Items]
Fixed asset acquisition commitments	$ 462,000
Number of fixed asset purchased | Property	2
Halifax, PA [Member] | Land [Member]
Commitments Contingencies And Guarantees [Line Items]
Fixed asset acquisition commitments	$ 504,000
Financial Standby Letters of Credit [Member]
Commitments Contingencies And Guarantees [Line Items]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 23,595,000	$ 14,000,000

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- Definition

Commitments Contingencies And Guarantees [Line Items]

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Purchase commitment settlement payment date.

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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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The number of real estate properties owned as of the balance sheet date.

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